Polypeptides

ABSTRACT

The present invention provides a bispecific polypeptides, such as bispecific antibodies, comprising a first binding domain capable of specifically binding to a first T cell target, and a second binding domain capable of specifically binding to a second T cell target, wherein the first and second T cell targets are different targets. The invention further provides compositions of said bispecific polypeptides, as well as methods and uses of the same.

This application is a continuation application of U.S. patent application Ser. No. 15/567,163, filed Oct. 17, 2017, which is a § 371 application of PCT/EP2016/061420, filed May 20, 2016, which claims priority to GB Application No. 1508729.9, filed May 21, 2015, GB Application No. 1514994.1, filed Aug. 24, 2015, and GB Application No. 1605450.4, filed Mar. 31, 2016. The entire disclosure of each of the foregoing applications is incorporated by reference herein.

Incorporated herein by reference in its entirety is the Sequence Listing being concurrently submitted via EFS-Web as a text file named SeqList.txt, created Feb. 3, 2020, and having a size of 274,067 bytes.

FIELD OF INVENTION

The present invention relates to bispecific polypeptides which specifically bind to two different T cell targets. Exemplary T cell targets include OX40, CTLA-4 and CD137, in particular human OX40, CTLA-4 and CD137.

BACKGROUND

Cancer is a leading cause of premature deaths in the developed world. Immunotherapy of cancer aims to mount an effective immune response against tumour cells. This may be achieved by, for example, breaking tolerance against tumour antigen, augmenting anti-tumor immune responses, and stimulating local cytokine responses at the tumor site. The key effector cell of a long lasting anti-tumor immune response is the activated tumor specific effector T cell. Potent expansion of activated effector T cells can redirect the immune response towards the tumor. In this context, regulatory T cells (Treg) play a role in inhibiting the anti-tumor immunity. Depleting, inhibiting, reverting or inactivating Tregs may therefore provide anti-tumor effects and revert the immune suppression in the tumor microenvironment. Further, incomplete activation of effector T cells by, for example, dendritic cells can cause T cell anergy, which results in an inefficient anti-tumor response, whereas adequate induction by dendritic cells can generate a potent expansion of activated effector T cells, redirecting the immune response towards the tumor. In addition, Natural killer (NK) cells play an important role in tumor immunology by attacking tumor cells with down-regulated human leukocyte antigen (HLA) expression and by inducing antibody dependent cellular cytotoxicity (ADCC). Stimulation of NK cells may thus also reduce tumor growth.

OX40 (otherwise known as CD134 or TNFRSF4) is a member of the TNFR family that is expressed mainly on activated T cells (mostly CD4+ effector T cells, but also CD8+ effector T-cells and regulatory T cells (Tregs)). In mice the expression is constitutive on Tregs, but not in humans. OX40 expression typically occurs within 24 hours of activation (T cell receptor engagement) and peaks after 48-72 hours. OX40 stimulation is important for the survival and proliferation of activated T cells. The only known ligand for OX40 is OX40L, which is mainly expressed on antigen presenting cells, such as dendritic cells and B cells, typically following their activation. The net result of OX40-mediated T cell activation is the induction of a TH1 effector T cell activation profile and a reduction in the activity and/or numbers of Treg cells e.g. via ADCC or ADCP. Overall these effects may contribute to anti-tumor immunity. OX40 is overexpressed on regulatory T cells in many solid tumors, such as melanoma, lung cancer and renal cancer.

OX40 agonist treatment of tumor models in mice has been shown to result in anti-tumor effects and cure of several different cancer forms, including melanoma, glioma, sarcoma, prostate, colon and renal cancers. The data is consistent with a tumor specific T-cell response, involving both CD4+ and CD8+ T cells, similar to the effect seen with CD40 agonist treatments. Addition of IL-12 and other cytokines, and combination with other immunomodulators and chemo/radiotherapy, has been shown to improve the therapeutic effect of OX40 agonist treatment. Evidence from pre-clinical models suggests that the effect of anti-OX40 antibodies is dependent upon activating FcγR. A clinical phase I study testing the mouse anti-human OX40 Clone 9B12 in late stage patients that had failed all other therapy has been conducted at the Providence Cancer Centre. The antibody was well-tolerated. Tumor shrinkage and an increase in CD4+ and CD8+ T cell proliferation were observed. The low toxicity may be caused by low half-life and anti-drug antibodies (the antibody was a mouse antibody), but also by the relatively low expression levels of OX40 on non-activated T cells. The anti-tumor effect with this antibody was modest.

CD137 (4-1BB, TNFRSF9) is also a member of the TNFR family. Activation of CD137 is dependent on receptor oligomerization. CD137 is expressed on activated CD4+ and CD8+ T cells, Treg, DC, monocytes, mast cells and eosinophils. CD137 activation plays an important role in CD8+ T cell activation and survival. It sustains and augments, rather than initiates effector functions and preferentially supports TH1 cytokine production. In CD4+ T cells, CD137 stimulation initially results in activation and later in activation-induced cell death, which may explain why CD137 agonistic antibodies have shown therapeutic effect in tumor immunity as well as in autoimmunity. CD137 also suppresses Treg function. CD137 is upregulated on NK cells activated by cytokines or CD16. Activation of CD137 on NK cells has been shown to increase ADCC activity of NK cells in both murine and human cells. Further, CD137 is expressed on antigen presenting cells, such as dendritic cells and macrophages, and stimulation of CD137 on these cell types may induce immune activation that can result in tumor directed immunity. CD137 agonistic antibody has also been shown to activate endothelial cells in the tumor environment, leading to upregulation of ICAM-1 and VCAM-1 and improved T cell recruitment. Several studies have demonstrated induction of tumor immunity by treatment with agonistic CD137 antibodies.

Two CD137 antibodies are in clinical development. Urelumab (BMS-66513) is a fully human IgG4 antibody developed by Bristol-Myers Squibb. Several phase I and II studies in various indications are currently ongoing. A Phase II study with Urelumab as a second line therapy in metastatic melanoma was terminated in 2009 due to fatal hepatoxicity. The other CD137 mAb in clinical development is PF-05082566, a fully human IgG2 antibody developed by Pfizer. It is currently in phase I development in lymphoma and various solid cancers and preliminary data suggest that it is well tolerated but with only modest anti-tumor effects.

Existing antibodies targeting CD137 or OX40 are in general dependent on cross linking via e.g. Fcgamma Receptors on other cells to induce strong signaling into cells expressing the respective receptor. Thus, they do not signal efficiently when no such cross linking is provided. In addition, prolonged and continuous activation through TNF receptor family members may lead to immune exhaustion.

The T cell receptor CTLA-4, serves as a negative regulator of T cell activation, and is upregulated on the T-cell surface following initial activation. The ligands of the CTLA-4 receptor, which are expressed by antigen presenting cells are the B7 proteins. The corresponding ligand receptor pair that is responsible for the upregulation of T cell activation is CD28-B7. Signalling via CD28 constitutes a costimulatory pathway, and follows upon the activation of T cells, through the T cell receptor recognizing antigenic peptide presented by the MHC complex. By blocking the CTLA-4 interaction to the B7-1 and, or B7-2 ligands, one of the normal check points of the immune response may be removed. The net result is enhanced activity of effector T cells which may contribute to anti-tumour immunity. As with OX40, this may be due to direct activation of the effector T cells but may also be due to a reduction in the activity and/or numbers of Treg cells, e.g. via ADCC or ADCP. Clinical studies have demonstrated that CTLA-4 blockade generates anti-tumor effects, but administration of anti-CTLA-4 antibodies has been associated with toxic side-effects. CTLA-4 is overexpressed on regulatory T cells in many solid tumors, such as melanoma lung cancer and renal cancer.

There is a need for an alternative to the existing monospecific drugs that target only one T cell target, such as OX40 or CD137 or CTLA-4.

SUMMARY OF INVENTION

A first aspect of the invention provides a bispecific polypeptide comprising a first binding domain, designated B1, which is capable of specifically binding to a first T cell target, and a second binding domain, designated B2, which is capable of specifically binding to a second T cell target, wherein the first and second T cell targets are different targets.

Bispecific antibodies targeting two different T cell targets, such as CTLA-4, CD137 and OX40, have the potential to specifically activate the immune system in locations were both targets are over expressed. For example, CTLA-4 and OX40 are overexpressed on regulatory T cells (Treg) in the tumor microenvironment, whereas their expression on effector T cells is lower. Thus, the bispecific antibodies of the invention have the potential to selectively target regulatory T cells in the tumor microenvironment.

Targeting Treg cells in the tumor microenvironment with a bispecific antibody of the invention also has the potential to deplete or reverse the immune suppressive function of the Tregs. This effect could be mediated by ADCC or ADCP induction via the Fc part of the bispecific antibody of the invention (for example, see Furness et al., 2014 Trends Immunol 35(7):290-8; the disclosures of which are incorporated herein by reference) or by signaling induced via OX40 and/or CTLA-4 and/or by blocking the CTLA-4 signaling pathway (for example, see Walker, 2014, Nature Reviews 11(12):852-63; the disclosures of which are incorporated herein by reference). On effector T cells, on the other hands, the bispecific antibodies of the invention have the potential to induce activation and increased function both via OX40 stimulation and through CTLA-4 checkpoint blockade.

The net effects of the bispecific antibodies targeting two T-cell receptors are thus:

-   -   1. A higher degree of immune activation compared to monospecific         antibodies. The immune activation is higher than the combination         of the monospecific antibodies.     -   2. A higher degree of induction of ADCC compared to the         monospecific binders in combination.     -   3. A more directed/localized immune activation. The immune         activation only occurs in environments that contains both high         CTLA-4 expression and OX40 expression. The tumor         microenvironment is such an environment. This has the potential         to increase the effect and also to minimize toxic side effect.         Thus the therapeutic window will be increased.

In exemplary embodiments, the bispecific polypeptide is capable of binding specifically to:

-   -   (a) OX40 and CTLA-4;     -   (b) OX40 and CD137; or     -   (c) CD137 and CTLA-4.

A “polypeptide” is used herein in its broadest sense to refer to a compound of two or more subunit amino acids, amino acid analogs, or other peptidomimetics. The term “polypeptide” thus includes short peptide sequences and also longer polypeptides and proteins. As used herein, the term “amino acid” refers to either natural and/or unnatural or synthetic amino acids, including both D or L optical isomers, and amino acid analogs and peptidomimetics.

The term “bispecific” as used herein means the polypeptide is capable of specifically binding at least two target entities.

In one embodiment the first and/or second binding domains may be selected from the group consisting of: antibodies or antigen-binding fragments thereof.

For example, the bispecific polypeptide of the invention may comprise:

-   -   (i) a first binding domain which comprises or consists of an         antibody variable domain or part thereof and a second binding         domain which comprises or consists of an antibody variable         domain or part thereof; or     -   (ii) a first binding domain which comprises or consists of an         antibody variable domain or part thereof and a second binding         domain which is not an antibody variable domain or part thereof.

Thus, in one embodiment the polypeptide is a bispecific antibody.

As used herein, the terms “antibody” or “antibodies” refer to molecules that contain an antigen binding site, e.g. immunoglobulin molecules and immunologically active fragments of immunoglobulin molecules that contain an antigen binding site. Immunoglobulin molecules can be of any type (e.g. IgG, IgE, IgM, IgD, IgA and IgY), class (e.g. IgG1, IgG2, IgG3, IgG4, IgA1 and IgA2) or a subclass of immunoglobulin molecule. Antibodies include, but are not limited to, synthetic antibodies, monoclonal antibodies, single domain antibodies, single chain antibodies, recombinantly produced antibodies, multi-specific antibodies (including bi-specific antibodies), human antibodies, humanized antibodies, chimeric antibodies, intrabodies, scFvs (e.g. including mono-specific and bi-specific, etc.), Fab fragments, F(ab′) fragments, disulfide-linked Fvs (sdFv), anti-idiotypic (anti-Id) antibodies, and epitope-binding fragments of any of the above.

The terms antibody “directed to” or “directed against” are used interchangeably herein and refer to an antibody that is constructed to direct its binding specificity(ies) at a certain target/marker/epitope/antigen, i.e. an antibody that immunospecifically binds to a target/marker/epitope/antigen. Also, the expression antibodies “selective for” a certain target/marker/epitope may be used, having the same definition as “directed to” or “directed against”. A bi-specific antibody directed to (selective for) two different targets/markers/epitopes/antigens binds immunospecifically to both targets/markers/epitopes/antigens.

If an antibody is directed to a certain target antigen, such as CD137, it is thus assumed that said antibody could be directed to any suitable epitope present on said target antigen structure.

As used herein, the term “antibody fragment” is a portion of an antibody such as F(ab′).sub.2, F(ab).sub.2, Fab′, Fab, Fv, scFv and the like. Regardless of structure, an antibody fragment binds with the same antigen that is recognized by the intact antibody. For example, an anti-OX4 antibody fragment binds to OX40. The term “antibody fragment” also includes isolated fragments consisting of the variable regions, such as the “Fv” fragments consisting of the variable regions of the heavy and light chains and recombinant single chain polypeptide molecules in which light and heavy variable regions are connected by a peptide linker (“scFv proteins”). As used herein, the term “antibody fragment” does not include portions of antibodies without antigen binding activity, such as Fc fragments or single amino acid residues.

ScFv are particularly preferred for inclusion in the bispecific antibodies of the invention.

Thus, in exemplary embodiments of the bispecific antibodies of the invention:

-   -   (a) binding domain B1 and/or binding domain B2 is an intact IgG         antibody (or, together, form an intact IgG antibody);     -   (b) binding domain B1 and/or binding domain B2 is an Fv fragment         (e.g. an scFv);     -   (c) binding domain B1 and/or binding domain B2 is a Fab         fragment; and/or     -   (d) binding domain B1 and/or binding domain B2 is a single         domain antibody (e.g. domain antibodies and nanobodies).

It will be appreciated by persons skilled in the art that the bispecific polypeptides of the invention may be of several different structural formats (for example, see Chan & Carter, 2016, Nature Reviews Immunology 10, 301-316, the disclosures of which are incorporated herein by reference).

In exemplary embodiments, the bispecific antibody is selected from the groups consisting of:

-   -   (a) bivalent bispecific antibodies, such as IgG-scFv bispecific         antibodies (for example, wherein B1 is an intact IgG and B2 is         an scFv attached to B1 at the N-terminus of a light chain and/or         at the C-terminus of a light chain and/or at the N-terminus of a         heavy chain and/or at the C-terminus of a heavy chain of the         IgG, or vice versa);     -   (b) monovalent bispecific antibodies, such as a DuoBody® (Genmab         AS, Copenhagen, Denmark) or ‘knob-in-hole’ bispecific antibody         (for example, an scFv-KIH, scFv-KIH^(r), a BiTE-KIH or a         BiTE-KIH^(r) (see Xu et al., 2015, mAbs 7(1):231-242);     -   (c) scFv₂-Fc bispecific antibodies (such as ADAPTIR™ bispecific         antibodies from Emergent Biosolutions Inc);     -   (d) BiTE/scFv₂ bispecific antibodies;     -   (e) DVD-Ig bispecific antibodies;     -   (f) DART-based bispecific antibodies (for example, DART₂-Fc,         DART₂-Fc or DART);     -   (g) DNL-Fab₃ bispecific antibodies; and     -   (h) scFv-HSA-scFv bispecific antibodies.

For example, the bispecific antibody may be an IgG-scFv antibody. The IgG-scFv antibody may be in either VH-VL or VL-VH orientation. In one embodiment, the scFv may be stabilised by a S—S bridge between VH and VL.

In one embodiment, binding domain B1 and binding domain B2 are fused directly to each other.

In an alternative embodiment, binding domain B1 and binding domain B2 are joined via a polypeptide linker. For example, a polypeptide linker may be a short linker peptide between about 10 to about 25 amino acids. The linker is usually rich in glycine for flexibility, as well as serine or threonine for solubility, and can either connect the N-terminus of the VH with the C-terminus of the VL, or vice versa. Exemplary linkers include a peptide of amino acid sequence as shown in any one of SEQ ID NOs. 47 to 50, or 144. The peptide of sequence GGGGSGGGGSGGGGS (SEQ ID NO: 144) is particularly preferred. The same linkers may be used to join the anti-OX40 part of a bispecific antibody of the invention to the anti-CD137 part.

The bispecific polypeptides of the invention may be manufactured by any known suitable method used in the art. Methods of preparing bi-specific antibodies of the present invention include BiTE (Micromet), DART (MacroGenics), Fcab and Mab² (F-star), Fc-engineered IgGI (Xencor) or DuoBody (based on Fab arm exchange, Genmab). Examples of other platforms useful for preparing bi-specific antibodies include but are not limited to those described in WO 2008/119353 (Genmab), WO 2011/131746 (Genmab) and reported by van der Neut-Kolfschoten et al. (2007, Science 317(5844):1554-7). Traditional methods such as the hybrid hybridoma and chemical conjugation methods (Marvin and Zhu (2005) Acta Pharmacol Sin 26: 649) can also be used. Co-expression in a host cell of two antibodies, consisting of different heavy and light chains, leads to a mixture of possible antibody products in addition to the desired bi-specific antibody, which can then be isolated by, e.g. affinity chromatography or similar methods.

It will be appreciated by persons skilled in the art that the bispecific antibody may comprise a human Fc region, or a variant of a said region, where the region is an IgG1, IgG2, IgG3 or IgG4 region, preferably an IgG1 or IgG4 region.

The constant (Fc) regions of the antibodies may mediate the binding of the immunoglobulin to host tissues or factors, including various cells of the immune system (e.g., effector cells) and the first component (Clq) of the classical complement system. The Fc region is preferably a human Fc region, or a variant of a said region. The Fc region may be an IgG1, IgG2, IgG3 or IgG4 region, preferably an IgG1 or IgG4 region. A variant of an Fc region typically binds to Fc receptors, such as FcgammaR and/or neonatal Fc receptor (FcRn) with altered affinity providing for improved function and/or half-life of the polypeptide. The biological function and/or the half-life may be either increased or a decreased relative to the half-life of a polypeptide comprising a native Fc region. Examples of such biological functions which may be modulated by the presence of a variant Fc region include antibody dependent cell cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), complement-dependent cytotoxicity (CDC), and/or apoptosis.

An exemplary heavy chain constant region amino acid sequence which may be combined with any VH region sequence disclosed herein (to form a complete heavy chain) is the IgG1 heavy chain constant region sequence reproduced here:

(SEQ ID NO: 135) ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGV HTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEP KSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVS HEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGK EYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTC LVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRW QQGNVFSCSVMHEALHNHYTQKSLSLSPGK

Other heavy chain constant region sequences are known in the art and could also be combined with any VH region disclosed herein. For example, a preferred constant region is a modified IgG4 constant region such as that reproduced here:

(SEQ ID NO: 137) ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGV HTFPAVLQSSGLYSLSSVVTVPSSSLGTKTYTCNVDHKPSNTKVDKRVES KYGPPCPPCPAPEFLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSQED PEVQFNWYVDGVEVHNAKTKPREEQFNSTYRVVSVLTVLHQDWLNGKEYK CKVSNKGLPSSIEKTISKAKGQPREPQVYTLPPSQEEMTKNQVSLTCLVK GFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSRLTVDKSRWQEG NVFSCSVMHEALHNRYTQKSLSLSLGK

This modified IgG4 sequence exhibits reduced FcRn binding and hence results in a reduced serum half-life relative to wild type IgG4. In addition, it exhibits stabilization of the core hinge of IgG4 making the IgG4 more stable, preventing Fab arm exchange.

Another preferred constant region is a modified IgG4 constant region such as that reproduced here:

(SEQ ID NO: 139) ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGV HTFPAVLQSSGLYSLSSVVTVPSSSLGTKTYTCNVDHKPSNTKVDKRVES KYGPPCPPCPAPEFLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSQED PEVQFNWYVDGVEVHNAKTKPREEQFNSTYRVVSVLTVLHQDWLNGKEYK CKVSNKGLPSSIEKTISKAKGQPREPQVYTLPPSQEEMTKNQVSLTCLVK GFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSRLTVDKSRWQEG NVFSCSVMHEALHNHYTQKSLSLSLGK

This modified IgG4 sequence results in stabilization of the core hinge of IgG4 making the IgG4 more stable, preventing Fab arm exchange

Also preferred is a wild type IgG4 constant region such as that reproduced here:

(SEQ ID NO: 138) ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGV HTFPAVLQSSGLYSLSSVVTVPSSSLGTKTYTCNVDHKPSNTKVDKRVES KYGPPCPSCPAPEFLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSQED PEVQFNWYVDGVEVHNAKTKPREEQFNSTYRVVSVLTVLHQDWLNGKEYK CKVSNKGLPSSIEKTISKAKGQPREPQVYTLPPSQEEMTKNQVSLTCLVK GFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSRLTVDKSRWQEG NVFSCSVMHEALHNHYTQKSLSLSLGK

An exemplary light chain constant region amino acid sequence which may be combined with any VL region sequence disclosed herein (to form a complete light chain) is the kappa chain constant region sequence reproduced here:

(SEQ ID NO: 136) RTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSG NSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTK SFNRGEC

Other light chain constant region sequences are known in the art and could also be combined with any VL region disclosed herein.

The antibody, or antigen binding fragment thereof, has certain preferred binding characteristics and functional effects, which are explained in more detail below. Said antibody, or antigen binding fragment thereof, preferably retains these binding characteristics and functional effects when incorporated as part of a bispecific polypeptide of the invention.

In one embodiment the antigen-binding fragment may be selected from the group consisting of: an Fv fragment (such as a single chain Fv fragment, or a disulphide-bonded Fv fragment), a Fab-like fragment (such as a Fab fragment; a Fab′ fragment or a F(ab)₂ fragment) and domain antibodies.

In one embodiment the bispecific polypeptide may be an IgG1 antibody with a non-immunoglobulin polypeptide (such as a CTLA-4 binding domain, e.g. CD86 or a mutated form thereof such as SEQ ID NO: 17; see below) fused to the C-terminal part of the kappa chain.

In one embodiment the bispecific polypeptide may be an IgG1 antibody with a scFv fragment fused to the C-terminal end of the heavy gamma 1 chain.

In one embodiment the bispecific polypeptide may contain 2-4 scFv binding to two different targets.

By “T cell target” we include polypeptide receptors located in the cell membrane of CD3+ T cells in an activated or inactive state. Such membrane-bound receptors may be exposed extracellularly in order that they accessed by the bispecific polypeptides of the invention following administration.

It will be appreciated by persons skilled in the art that the T cell targets may be localised on the surface of a cell. By “localised on the surface of a cell” it is meant that the T cell target is associated with the cell such that one or more region of the T cell target is present on the outer face of the cell surface. For example, the T cell target may be inserted into the cell plasma membrane (i.e. orientated as a transmembrane protein) with one or more regions presented on the extracellular surface. This may occur in the course of expression of the T cell target by the cell. Thus, in one embodiment, “localised on the surface of a cell” may mean “expressed on the surface of a cell.” Alternatively, the T cell target may be outside the cell with covalent and/or ionic interactions localising it to a specific region or regions of the cell surface.

In one embodiment the first and/or second T cell target may be a checkpoint molecule. For example, in one embodiment the first and/or second T cell target is a co-stimulatory or co-inhibitory molecule.

By “co-stimulatory” we include co-signalling molecules which are capable of promoting T cell activation. By “co-inhibitory” we include co-signalling molecules which are capable of suppressing T cell activation.

Accordingly, in one embodiment at least one of the T cell targets may be a stimulatory checkpoint molecule (such as CD137, GITR, CD27, CD28, ICOS and OX40).

Advantageously, the bispecific polypeptide of the invention is an agonist at a stimulatory checkpoint molecule.

Alternatively or additionally, at least one of the T cell targets may be an inhibitory checkpoint molecule (such as CTLA-4, PD-1, Tim3, Lag3, Tigit or VISTA). Advantageously, the bispecific polypeptide of the invention is an antagonist at an inhibitory checkpoint molecule.

In one embodiment at least one of the T cell targets is a TNFR (tumor necrosis factor receptor) superfamily member. By TNFR superfamily member we include cytokine receptors characterised by the ability to bind tumor necrosis factors (TNFs) via an extracellular cysteine-rich domain. Examples of TNFRs include OX40 and CD137.

In one embodiment the first and/or second T cell target may be selected from the group consisting of: OX40, CTLA-4, CD137, CD40 and CD28. For example, the first and/or second T cell target may be selected from the group consisting of OX40, CTLA-4 and CD137.

It will be appreciated by persons skilled in the art that the bispecific antibodies of the invention may be capable of inducing antibody dependent cell cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), complement-dependent cytotoxicity (CDC), and/or apoptosis.

In a further embodiment the polypeptide is capable of inducing tumour immunity. This can be tested in vitro in T cell activation assays, e.g. by measuring. IL-2 and IFNγ production. Activation of effector T cells would imply that a tumor specific T cell response can be achieved in vivo. Further, an anti-tumor response in an in vivo model, such as a mouse model would imply that a successful immune response towards the tumor has been achieved.

The antibody may modulate the activity of a cell expressing the T cell target, wherein said modulation is an increase or decrease in the activity of said cell. The cell is typically a T cell. The antibody may increase the activity of a CD4+ or CD8+ effector cell, or may decrease the activity of a regulatory T cell (Treg). In either case, the net effect of the antibody will be an increase in the activity of effector T cells, particularly CD4+ effector T cells. Methods for determining a change in the activity of effector T cells are well known and include, for example, measuring for an increase in the level of T cell IL-2 production or an increase in T cell proliferation in the presence of the antibody relative to the level of T cell IL-2 production and/or T cell proliferation in the presence of a control. Assays for cell proliferation and/or IL-2 production are well known and are exemplified in the Examples.

Standard assays to evaluate the binding ability of ligands towards targets are well known in the art, including for example, ELISAs, Western blots, RIAs, and flow cytometry analysis. The binding kinetics (e.g., binding affinity) of the polypeptide also can be assessed by standard assays known in the art, such as by Surface Plasmon Resonance analysis (SPR).

The terms “binding activity” and “binding affinity” are intended to refer to the tendency of a polypeptide molecule to bind or not to bind to a target. Binding affinity may be quantified by determining the dissociation constant (Kd) for a polypeptide and its target. A lower Kd is indicative of a higher affinity for a target. Similarly, the specificity of binding of a polypeptide to its target may be defined in terms of the comparative dissociation constants (Kd) of the polypeptide for its target as compared to the dissociation constant with respect to the polypeptide and another, non-target molecule.

The value of this dissociation constant can be determined directly by well-known methods, and can be computed even for complex mixtures by methods such as those, for example, set forth in Caceci et al. (Byte 9:340-362, 1984; the disclosures of which are incorporated herein by reference). For example, the Kd may be established using a double-filter nitrocellulose filter binding assay such as that disclosed by Wong & Lohman (Proc. Natl. Acad. Sci. USA 90, 5428-5432, 1993). Other standard assays to evaluate the binding ability of ligands such as antibodies towards targets are known in the art, including for example, ELISAs, Western blots, RIAs, and flow cytometry analysis. The binding kinetics (e.g., binding affinity) of the antibody also can be assessed by standard assays known in the art, such as by Biacore™ system analysis.

A competitive binding assay can be conducted in which the binding of the antibody to the target is compared to the binding of the target by another, known ligand of that target, such as another antibody. The concentration at which 50% inhibition occurs is known as the Ki. Under ideal conditions, the Ki is equivalent to Kd. The Ki value will never be less than the Kd, so measurement of Ki can conveniently be substituted to provide an upper limit for Kd.

Alternative measures of binding affinity include EC50 or IC50. In this context EC50 indicates the concentration at which a polypeptide achieves 50% of its maximum binding to a fixed quantity of target. IC50 indicates the concentration at which a polypeptide inhibits 50% of the maximum binding of a fixed quantity of competitor to a fixed quantity of target. In both cases, a lower level of EC50 or IC50 indicates a higher affinity for a target. The EC50 and IC50 values of a ligand for its target can both be determined by well-known methods, for example ELISA. Suitable assays to assess the EC50 and IC50 of polypeptides are set out in the Examples.

A polypeptide of the invention is preferably capable of binding to its target with an affinity that is at least two-fold, 10-fold, 50-fold, 100-fold or greater than its affinity for binding to another non-target molecule.

The polypeptide of the invention may be produced by any suitable means. For example, all or part of the polypeptide may be expressed as a fusion protein by a cell comprising a nucleotide which encodes said polypeptide.

Alternatively parts B1 and B2 may be produced separately and then subsequently joined together. Joining may be achieved by any suitable means, for example using the chemical conjugation methods and linkers outlined above. Separate production of parts B1 and B2 may be achieved by any suitable means. For example by expression from separate nucleotides optionally in separate cells, as is explained in more detail below.

Variants

The bispecific polypeptides or constituent binding domains thereof (such as the OX40, CD137 and CTLA-4 binding domains) described herein may comprise a variant or a fragment of any of the specific amino acid sequences recited herein, provided that the polypeptide or binding domain retains binding to its target. In one embodiment the variant of an antibody or antigen binding fragment may retain the CDR sequences of the sequences recited herein. For example, the anti-OX40 or anti-CD137 antibody may comprise a variant or a fragment of any of the specific amino acid sequences recited in Tables B and H, provided that the antibody retains binding to its target. Such a variant or fragment may typically retain the CDR sequences of the said sequence of Table B or H. The CTLA-4 binding domain may comprise a variant of any of the sequences of Table C, providing that that the binding domain retains binding to its target.

A fragment of any one of the heavy or light chain amino acid sequences recited herein may comprise at least 7, at least 8, at least 9, at least 10, at least 12, at least 15, at least 18, at least 20, at least 25, at least 50, at least 60, at least 70, at least 80, at least 90 or at least 100 consecutive amino acids from the said amino acid sequence.

A variant of any one of the heavy or light chain amino acid sequences recited herein may be a substitution, deletion or addition variant of said sequence. A variant may comprise 1, 2, 3, 4, 5, up to 10, up to 20, up to 30 or more amino acid substitutions and/or deletions from the said sequence. “Deletion” variants may comprise the deletion of individual amino acids, deletion of small groups of amino acids such as 2, 3, 4 or 5 amino acids, or deletion of larger amino acid regions, such as the deletion of specific amino acid domains or other features. “Substitution” variants preferably involve the replacement of one or more amino acids with the same number of amino acids and making conservative amino acid substitutions. For example, an amino acid may be substituted with an alternative amino acid having similar properties, for example, another basic amino acid, another acidic amino acid, another neutral amino acid, another charged amino acid, another hydrophilic amino acid, another hydrophobic amino acid, another polar amino acid, another aromatic amino acid or another aliphatic amino acid. Some properties of the 20 main amino acids which can be used to select suitable substituents are as follows:

Ala, A aliphatic, hydrophobic, neutral Met, M hydrophobic, neutral Cys, C polar, hydrophobic, neutral Asn, N polar, hydrophilic, neutral Asp, D polar, hydrophilic, charged (−) Pro, P hydrophobic, neutral Glu, E polar, hydrophilic, charged (−) Gln, Q polar, hydrophilic, neutral Phe, F aromatic, hydrophobic, Arg, R polar, hydrophilic, neutral charged (+) Gly, G aliphatic, neutral Ser, S polar, hydrophilic, neutral His, H aromatic, polar, hydrophilic, Thr, T polar, hydrophilic, charged (+) neutral Ile, I aliphatic, hydrophobic, Val, V aliphatic, hydrophobic, neutral neutral Lys, K polar, hydrophilic, Trp, W aromatic, hydrophobic, charged(+) neutral Leu, L aliphatic, hydrophobic, Tyr, Y aromatic, polar, neutral hydrophobic

Amino acids herein may be referred to by full name, three letter code or single letter code.

Preferred “derivatives” or “variants” include those in which instead of the naturally occurring amino acid the amino acid which appears in the sequence is a structural analog thereof. Amino acids used in the sequences may also be derivatised or modified, e.g. labelled, providing the function of the antibody is not significantly adversely affected.

Derivatives and variants as described above may be prepared during synthesis of the antibody or by post-production modification, or when the antibody is in recombinant form using the known techniques of site-directed mutagenesis, random mutagenesis, or enzymatic cleavage and/or ligation of nucleic acids.

Preferably variants have an amino acid sequence which has more than 60%, or more than 70%, e.g. 75 or 80%, preferably more than 85%, e.g. more than 90 or 95% amino acid identity to a sequence as shown in the sequences disclosed herein. This level of amino acid identity may be seen across the full length of the relevant SEQ ID NO sequence or over a part of the sequence, such as across 20, 30, 50, 75, 100, 150, 200 or more amino acids, depending on the size of the full length polypeptide.

In connection with amino acid sequences, “sequence identity” refers to sequences which have the stated value when assessed using ClustalW (Thompson et al., 1994, Nucleic Acids Res. 22(22):4673-80; the disclosures of which are incorporated herein by reference) with the following parameters:

Pairwise alignment parameters—Method: accurate, Matrix: PAM, Gap open penalty: 10.00, Gap extension penalty: 0.10;

Multiple alignment parameters—Matrix: PAM, Gap open penalty: 10.00, % identity for delay: 30, Penalize end gaps: on, Gap separation distance: 0, Negative matrix: no, Gap extension penalty: 0.20, Residue-specific gap penalties: on, Hydrophilic gap penalties: on, Hydrophilic residues: GPSNDQEKR. Sequence identity at a particular residue is intended to include identical residues which have simply been derivatised.

Polynucleotides, Vectors and Cells

The invention also relates to polynucleotides that encode all or part of a polypeptide of the invention. Thus, a polynucleotide of the invention may encode any polypeptide as described herein, or all or part of B1 or all or part of B2. The terms “nucleic acid molecule” and “polynucleotide” are used interchangeably herein and refer to a polymeric form of nucleotides of any length, either deoxyribonucleotides or ribonucleotides, or analogs thereof. Non-limiting examples of polynucleotides include a gene, a gene fragment, messenger RNA (mRNA), cDNA, recombinant polynucleotides, plasmids, vectors, isolated DNA of any sequence, isolated RNA of any sequence, nucleic acid probes, and primers.

A polynucleotide of the invention may be provided in isolated or substantially isolated form. By substantially isolated, it is meant that there may be substantial, but not total, isolation of the polypeptide from any surrounding medium. The polynucleotides may be mixed with carriers or diluents which will not interfere with their intended use and still be regarded as substantially isolated.

A nucleic acid sequence which “encodes” a selected polypeptide is a nucleic acid molecule which is transcribed (in the case of DNA) and translated (in the case of mRNA) into a polypeptide in vivo when placed under the control of appropriate regulatory sequences. The boundaries of the coding sequence are determined by a start codon at the 5′ (amino) terminus and a translation stop codon at the 3′ (carboxy) terminus. For the purposes of the invention, such nucleic acid sequences can include, but are not limited to, cDNA from viral, prokaryotic or eukaryotic mRNA, genomic sequences from viral or prokaryotic DNA or RNA, and even synthetic DNA sequences. A transcription termination sequence may be located 3′ to the coding sequence.

Representative polynucleotides which encode examples of a heavy chain or light chain amino acid sequence of an antibody may comprise or consist of any one of the nucleotide sequences disclosed herein, for example the sequences set out in Table B or H. Representative polynucleotides which encode the polypeptides shown in Tables D, G or H may comprise or consist of the corresponding nucleotide sequences which are also shown in Tables D, G or H (intron sequences are shown in lower case). Representative polynucleotides which encode examples of CTLA-4 binding domains may comprise or consist of any one of SEQ ID NOS: 25 to 43 as shown in Table E.

A suitable polynucleotide sequence may alternatively be a variant of one of these specific polynucleotide sequences. For example, a variant may be a substitution, deletion or addition variant of any of the above nucleic acid sequences. A variant polynucleotide may comprise 1, 2, 3, 4, 5, up to 10, up to 20, up to 30, up to 40, up to 50, up to 75 or more nucleic acid substitutions and/or deletions from the sequences given in the sequence listing.

Suitable variants may be at least 70% homologous to a polynucleotide of any one of nucleic acid sequences disclosed herein, preferably at least 80 or 90% and more preferably at least 95%, 97% or 99% homologous thereto. Preferably homology and identity at these levels is present at least with respect to the coding regions of the polynucleotides. Methods of measuring homology are well known in the art and it will be understood by those of skill in the art that in the present context, homology is calculated on the basis of nucleic acid identity. Such homology may exist over a region of at least 15, preferably at least 30, for instance at least 40, 60, 100, 200 or more contiguous nucleotides. Such homology may exist over the entire length of the unmodified polynucleotide sequence.

Methods of measuring polynucleotide homology or identity are known in the art. For example the UWGCG Package provides the BESTFIT program which can be used to calculate homology (e.g. used on its default settings) (Devereux et al, 1984, Nucleic Acids Research 12:387-395; the disclosures of which are incorporated herein by reference).

The PILEUP and BLAST algorithms can also be used to calculate homology or line up sequences (typically on their default settings), for example as described in Altschul, 1993, J Mol Evol 36:290-300; Altschul et al, 1990, J Mol Biol 215:403-10, the disclosures of which are incorporated herein by reference).

Software for performing BLAST analysis is publicly available through the National Centre for Biotechnology Information (http://www.ncbi.nlm.nih.gov/). This algorithm involves first identifying high scoring sequence pair (HSPs) by identifying short words of length W in the query sequence that either match or satisfy some positive-valued threshold score T when aligned with a word of the same length in a database sequence. T is referred to as the neighbourhood word score threshold (Altschul et al, supra). These initial neighbourhood word hits act as seeds for initiating searches to find HSPs containing them. The word hits are extended in both directions along each sequence for as far as the cumulative alignment score can be increased. Extensions for the word hits in each direction are halted when: the cumulative alignment score goes to zero or below, due to the accumulation of one or more negative-scoring residue alignments; or the end of either sequence is reached. The BLAST algorithm parameters W, T and X determine the sensitivity and speed of the alignment. The BLAST program uses as defaults a word length (W) of 11, the BLOSUM62 scoring matrix (see Henikoff & Henikoff, 1992, Proc. Natl. Acad. Sci. USA 89:10915-10919; the disclosures of which are incorporated herein by reference) alignments (B) of 50, expectation (E) of 10, M=5, N=4, and a comparison of both strands.

The BLAST algorithm performs a statistical analysis of the similarity between two sequences; see e.g. Karlin & Altschul, 1993, Proc. Natl. Acad. Sci. USA 90:5873-5787; the disclosures of which are incorporated herein by reference. One measure of similarity provided by the BLAST algorithm is the smallest sum probability (P(N)), which provides an indication of the probability by which a match between two nucleotide or amino acid sequences would occur by chance. For example, a sequence is considered similar to another sequence if the smallest sum probability in comparison of the first sequence to the second sequence is less than about 1, preferably less than about 0.1, more preferably less than about 0.01, and most preferably less than about 0.001.

The homologue may differ from a sequence in the relevant polynucleotide by less than 3, 5, 10, 15, 20 or more mutations (each of which may be a substitution, deletion or insertion). These mutations may be measured over a region of at least 30, for instance at least 40, 60 or 100 or more contiguous nucleotides of the homologue.

In one embodiment, a variant sequence may vary from the specific sequences given in the sequence listing by virtue of the redundancy in the genetic code. The DNA code has 4 primary nucleic acid residues (A, T, C and G) and uses these to “spell” three letter codons which represent the amino acids the proteins encoded in an organism's genes. The linear sequence of codons along the DNA molecule is translated into the linear sequence of amino acids in the protein(s) encoded by those genes. The code is highly degenerate, with 61 codons coding for the 20 natural amino acids and 3 codons representing “stop” signals. Thus, most amino acids are coded for by more than one codon—in fact several are coded for by four or more different codons. A variant polynucleotide of the invention may therefore encode the same polypeptide sequence as another polynucleotide of the invention, but may have a different nucleic acid sequence due to the use of different codons to encode the same amino acids.

A polypeptide of the invention may thus be produced from or delivered in the form of a polynucleotide which encodes and is capable of expressing it.

Polynucleotides of the invention can be synthesised according to methods well known in the art, as described by way of example in Green & Sambrook (2012, Molecular Cloning—a laboratory manual, 4th edition; Cold Spring Harbor Press; the disclosures of which are incorporated herein by reference).

The nucleic acid molecules of the present invention may be provided in the form of an expression cassette which includes control sequences operably linked to the inserted sequence, thus allowing for expression of the polypeptide of the invention in vivo. These expression cassettes, in turn, are typically provided within vectors (e.g., plasmids or recombinant viral vectors). Such an expression cassette may be administered directly to a host subject. Alternatively, a vector comprising a polynucleotide of the invention may be administered to a host subject. Preferably the polynucleotide is prepared and/or administered using a genetic vector. A suitable vector may be any vector which is capable of carrying a sufficient amount of genetic information, and allowing expression of a polypeptide of the invention.

The present invention thus includes expression vectors that comprise such polynucleotide sequences. Such expression vectors are routinely constructed in the art of molecular biology and may for example involve the use of plasmid DNA and appropriate initiators, promoters, enhancers and other elements, such as for example polyadenylation signals which may be necessary, and which are positioned in the correct orientation, in order to allow for expression of a peptide of the invention. Other suitable vectors would be apparent to persons skilled in the art (see Green & Sambrook, supra).

The invention also includes cells that have been modified to express a polypeptide of the invention. Such cells include transient, or preferably stable higher eukaryotic cell lines, such as mammalian cells or insect cells, lower eukaryotic cells, such as yeast or prokaryotic cells such as bacterial cells. Particular examples of cells which may be modified by insertion of vectors or expression cassettes encoding for a polypeptide of the invention include mammalian HEK293T, CHO, HeLa, NS0 and COS cells. Preferably the cell line selected will be one which is not only stable, but also allows for mature glycosylation and cell surface expression of a polypeptide.

Such cell lines of the invention may be cultured using routine methods to produce a polypeptide of the invention, or may be used therapeutically or prophylactically to deliver antibodies of the invention to a subject. Alternatively, polynucleotides, expression cassettes or vectors of the invention may be administered to a cell from a subject ex vivo and the cell then returned to the body of the subject.

Pharmaceutical Formulations, Therapeutic Uses and Patient Groups

In another aspect, the present invention provides compositions comprising molecules of the invention, such as the antibodies, bispecific polypeptides, polynucleotides, vectors and cells described herein. For example, the invention provides a composition comprising one or more molecules of the invention, such as one or more antibodies and/or bispecific polypeptides of the invention, and at least one pharmaceutically acceptable carrier.

As used herein, “pharmaceutically acceptable carrier” includes any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like that are physiologically compatible. Preferably, the carrier is suitable for parenteral, e.g. intravenous, intramuscular or subcutaneous administration (e.g., by injection or infusion). Depending on the route of administration, the polypeptide may be coated in a material to protect the polypeptide from the action of acids and other natural conditions that may inactivate or denature the polypeptide.

Preferred pharmaceutically acceptable carriers comprise aqueous carriers or diluents. Examples of suitable aqueous carriers that may be employed in the compositions of the invention include water, buffered water and saline. Examples of other carriers include ethanol, polyols (such as glycerol, propylene glycol, polyethylene glycol, and the like), and suitable mixtures thereof, vegetable oils, such as olive oil, and injectable organic esters, such as ethyl oleate. Proper fluidity can be maintained, for example, by the use of coating materials, such as lecithin, by the maintenance of the required particle size in the case of dispersions, and by the use of surfactants. In many cases, it will be preferable to include isotonic agents, for example, sugars, polyalcohols such as mannitol, sorbitol, or sodium chloride in the composition.

A composition of the invention also may include a pharmaceutically acceptable anti-oxidant. These compositions may also contain adjuvants such as preservatives, wetting agents, emulsifying agents and dispersing agents. Prevention of presence of microorganisms may be ensured both by sterilization procedures, supra, and by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid, and the like. It may also be desirable to include isotonic agents, such as sugars, sodium chloride, and the like into the compositions. In addition, prolonged absorption of the injectable pharmaceutical form may be brought about by the inclusion of agents which delay absorption such as aluminum monostearate and gelatin.

Therapeutic compositions typically must be sterile and stable under the conditions of manufacture and storage. The composition can be formulated as a solution, microemulsion, liposome, or other ordered structure suitable to high drug concentration.

Sterile injectable solutions can be prepared by incorporating the active agent (e.g. polypeptide) in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by sterilization microfiltration. Generally, dispersions are prepared by incorporating the active agent into a sterile vehicle that contains a basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum drying and freeze-drying (lyophilization) that yield a powder of the active agent plus any additional desired ingredient from a previously sterile-filtered solution thereof.

Particularly preferred compositions are formulated for systemic administration or for local administration. Local administration may be at the site of a tumour or into a tumour draining lymph node. The composition may preferably be formulated for sustained release over a period of time. Thus the composition may be provided in or as part of a matrix facilitating sustained release. Preferred sustained release matrices may comprise a montanide or γ-polyglutamic acid (PGA) nanoparticles. Localised release of a polypeptide of the invention, optionally over a sustained period of time, may reduce potential autoimmune side-effects associated with administration of a CTLA-4 antagonist.

Compositions of the invention may comprise additional active ingredients as well as a polypeptide of the invention. As mentioned above, compositions of the invention may comprise one or more polypeptides of the invention. They may also comprise additional therapeutic or prophylactic agents.

Also within the scope of the present invention are kits comprising polypeptides or other compositions of the invention and instructions for use. The kit may further contain one or more additional reagents, such as an additional therapeutic or prophylactic agent as discussed above.

The polypeptides in accordance with the present invention maybe used in therapy or prophylaxis. In therapeutic applications, polypeptides or compositions are administered to a subject already suffering from a disorder or condition, in an amount sufficient to cure, alleviate or partially arrest the condition or one or more of its symptoms. Such therapeutic treatment may result in a decrease in severity of disease symptoms, or an increase in frequency or duration of symptom-free periods. An amount adequate to accomplish this is defined as “therapeutically effective amount”. In prophylactic applications, polypeptides or compositions are administered to a subject not yet exhibiting symptoms of a disorder or condition, in an amount sufficient to prevent or delay the development of symptoms. Such an amount is defined as a “prophylactically effective amount”. The subject may have been identified as being at risk of developing the disease or condition by any suitable means.

In particular, antibodies and bispecific polypeptides of the invention may be useful in the treatment or prevention of cancer. Accordingly, the invention provides an antibody or bispecific polypeptide of the invention for use in the treatment or prevention of cancer. The invention also provides a method of treating or preventing cancer comprising administering to an individual a polypeptide of the invention. The invention also provides an antibody or bispecific polypeptide of the invention for use in the manufacture of a medicament for the treatment or prevention of cancer.

The cancer may be prostate cancer, breast cancer, colorectal cancer, pancreatic cancer, ovarian cancer, lung cancer, cervical cancer, rhabdomyosarcoma, neuroblastoma, multiple myeloma, leukemia, acute lymphoblastic leukemia, melanoma, bladder cancer, gastric cancer, head and neck cancer, liver cancer, skin cancer, lymphoma or glioblastoma.

An antibody or bispecific polypeptide of the present invention, or a composition comprising said antibody or said polypeptide, may be administered via one or more routes of administration using one or more of a variety of methods known in the art. As will be appreciated by the skilled artisan, the route and/or mode of administration will vary depending upon the desired results. Systemic administration or local administration are preferred. Local administration may be at the site of a tumour or into a tumour draining lymph node. Preferred modes of administration for polypeptides or compositions of the invention include intravenous, intramuscular, intradermal, intraperitoneal, subcutaneous, spinal or other parenteral modes of administration, for example by injection or infusion. The phrase “parenteral administration” as used herein means modes of administration other than enteral and topical administration, usually by injection. Alternatively, a polypeptide or composition of the invention can be administered via a non-parenteral mode, such as a topical, epidermal or mucosal mode of administration.

A suitable dosage of an antibody or polypeptide of the invention may be determined by a skilled medical practitioner. Actual dosage levels of the active ingredients in the pharmaceutical compositions of the present invention may be varied so as to obtain an amount of the active ingredient which is effective to achieve the desired therapeutic response for a particular patient, composition, and mode of administration, without being toxic to the patient. The selected dosage level will depend upon a variety of pharmacokinetic factors including the activity of the particular polypeptide employed, the route of administration, the time of administration, the rate of excretion of the polypeptide, the duration of the treatment, other drugs, compounds and/or materials used in combination with the particular compositions employed, the age, sex, weight, condition, general health and prior medical history of the patient being treated, and like factors well known in the medical arts.

A suitable dose of an antibody or polypeptide of the invention may be, for example, in the range of from about 0.1 μg/kg to about 100 mg/kg body weight of the patient to be treated. For example, a suitable dosage may be from about 1 μg/kg to about 10 mg/kg body weight per day or from about 10 g/kg to about 5 mg/kg body weight per day.

Dosage regimens may be adjusted to provide the optimum desired response (e.g., a therapeutic response). For example, a single bolus may be administered, several divided doses may be administered over time or the dose may be proportionally reduced or increased as indicated by the exigencies of the therapeutic situation. It is especially advantageous to formulate parenteral compositions in dosage unit form for ease of administration and uniformity of dosage. Dosage unit form as used herein refers to physically discrete units suited as unitary dosages for the subjects to be treated; each unit contains a predetermined quantity of active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier.

Antibodies or polypeptides may be administered in a single dose or in multiple doses. The multiple doses may be administered via the same or different routes and to the same or different locations. Alternatively, antibodies or polypeptides can be administered as a sustained release formulation as described above, in which case less frequent administration is required. Dosage and frequency may vary depending on the half-life of the polypeptide in the patient and the duration of treatment that is desired. The dosage and frequency of administration can also vary depending on whether the treatment is prophylactic or therapeutic. In prophylactic applications, a relatively low dosage may be administered at relatively infrequent intervals over a long period of time. In therapeutic applications, a relatively high dosage may be administered, for example until the patient shows partial or complete amelioration of symptoms of disease.

Combined administration of two or more agents may be achieved in a number of different ways. In one embodiment, the antibody or polypeptide and the other agent may be administered together in a single composition. In another embodiment, the antibody or polypeptide and the other agent may be administered in separate compositions as part of a combined therapy. For example, the modulator may be administered before, after or concurrently with the other agent.

An antibody, polypeptide or composition of the invention may also be used in a method of increasing the activation of a population of cells expressing the first and second T cell target, the method comprising administering to said population of cells a polypeptide or composition of the invention under conditions suitable to permit interaction between said cell and a polypeptide of the invention. The population of cells typically comprises at least some cells which express the first T cell target, typically T cells, and at least some cells which express the second T cell target. The method is typically carried out ex vivo.

For example, an antibody, polypeptide or composition of the invention may also be used in a method of increasing the activation of a population of cells expressing human OX40 and human CTLA-4, the method as described above.

Alternatively an antibody, polypeptide or composition of the invention may also be used in a method of increasing the activation of a population of cells expressing human OX40 and human CD137, the method as described above.

Alternatively an antibody, polypeptide or composition of the invention may also be used in a method of increasing the activation of a population of cells expressing human CTLA-4 and human CD137, the method as described above.

Binding Domains for CD137

The bispecific polypeptides of the invention may comprise a binding domain which is specific for CD137.

The antibody, or antigen binding fragment thereof, that binds specifically to CD137 has certain preferred binding characteristics and functional effects, which are explained in more detail below. Said antibody, or antigen binding fragment thereof, preferably retains these binding characteristics and functional effects when incorporated as part of a bispecific antibody of the invention. The invention also provides said antibody as an antibody or antigen-binding fragment thereof in isolated form, i.e. independently of a bispecific antibody of the invention.

The anti-CD137 antibody preferably specifically binds to CD137, i.e. it binds to CD137 but does not bind, or binds at a lower affinity, to other molecules. The term CD137 as used herein typically refers to human CD137. The sequence of human CD137 is set out in SEQ ID NO: 148 (corresponding to GenBank: AAH06196.1). The antibody may have some binding affinity for CD137 from other mammals, such as CD137 from a non-human primate, for example Macaca fascicularis (cynomolgus monkey). The antibody preferably does not bind to murine CD137 and/or does not bind to other human TNFR superfamily members, for example human OX40 or CD40.

The antibody has the ability to bind to CD137 in its native state and in particular to CD137 localised on the surface of a cell. Preferably, the antibody will bind specifically to CD137. That is, an antibody of the invention will preferably bind to CD137 with greater binding affinity than that at which it binds to another molecule.

“Localised on the surface of a cell” is as defined previously.

The antibody may modulate the activity of a cell expressing CD137, wherein said modulation is an increase or decrease in the activity of said cell. The cell is typically a T cell. The antibody may increase the activity of a CD4+ or CD8+ effector cell, or may decrease the activity of, or deplete, a regulatory T cell (T reg). In either case, the net effect of the antibody will be an increase in the activity of effector T cells, particularly CD4+, CD8+ or NK effector T cells. Methods for determining a change in the activity of effector T cells are well known and are as described earlier.

The antibody preferably causes an increase in activity in a CD8+ T cell in vitro, optionally wherein said increase in activity is an increase in proliferation, IFN-γ production and/or IL-2 production by the T cell. The increase is preferably at least 2-fold, more preferably at least 10-fold and even more preferably at least 25-fold higher than the change in activity caused by an isotype control antibody measured in the same assay.

The antibody preferably binds to human CD137 with a Kd value which is less than 10×10⁻⁹M or less than 7×10⁻⁹M, more preferably less than 4, or 2×10⁻⁹M, most preferably less than 1.2×10⁻⁹M.

For example, the antibody preferably does not bind to murine CD137 or any other TNFR superfamily member, such as OX40 or CD40. Therefore, typically, the Kd for the antibody with respect to human CD137 will be 2-fold, preferably 5-fold, more preferably 10-fold less than Kd with respect to the other, non-target molecule, such as murine CD137, other TNFR superfamily members, or any other unrelated material or accompanying material in the environment. More preferably, the Kd will be 50-fold less, even more preferably 100-fold less, and yet more preferably 200-fold less.

The value of this dissociation constant can be determined directly by well-known methods, as described earlier. A competitive binding assay can also be conducted, as described earlier.

An antibody of the invention is preferably capable of binding to its target with an affinity that is at least two-fold, 10-fold, 50-fold, 100-fold or greater than its affinity for binding to another non-target molecule.

In summary therefore, the anti-CD137 antibody preferably exhibits at least one of the following functional characteristics:

-   -   I. binding to human CD137 with a K_(D) value which is less than         10×10⁻⁹M, more preferably less than 1.2×10⁻⁹M; and     -   II. is capable of causing an increase in activity in a CD8+ T         cell in vitro, optionally wherein said increase in activity is         an increase in proliferation, IFN-γ production and/or IL-2         production by the T cell. The increase is preferably at least         2-fold, more preferably at least 10-fold and even more         preferably at least 25-fold higher than the change in activity         caused by an isotype control antibody measured in the same         assay.

The antibody is specific for CD137, typically human CD137 and may comprise any one, two, three, four, five or all six of the exemplary CDR sequences of any corresponding pair of rows in Tables I(1) and I(2).

For example, the antibody may comprise any one, two, three, four, five or all six of the exemplary CDR sequences of the first rows of Table I(1) and Table I(2) (SEQ ID NOs: 207, 212, 217, 80, 81, 222)

Alternatively the antibody may comprise any one, two, three, four, five or all six of the exemplary CDR sequences of the second, third, fourth or fifth rows of Tables I(1) and I(2).

Preferred anti-CD137 antibodies may comprise at least a heavy chain CDR3 as defined in any individual row of Table I(1) and/or a light chain CDR3 as defined in in any individual row of Table I(2). The antibody may comprise all three heavy chain CDR sequences shown in an individual row of Table I(1) (that is, all three heavy chain CDRs of a given “VH number”) and/or all three light chain CDR sequences shown in an individual row of Table I (2) (that is, all three light chain CDRs of a given “VL number”).

Examples of complete heavy and light chain variable region amino acid sequences of anti-CD137 antibodies are shown in Table H. Exemplary nucleic acid sequences encoding each amino acid sequence are also shown. SEQ ID NOs 177 to 196 refer to the relevant amino acid and nucleotide sequences of anti-CD137 antibodies. The numbering of said VH and VL regions in Table H corresponds to the numbering system used as in Table I(1) and (2). Thus, for example, the amino acid sequence for “1205, light chain VL” is an example of a complete VL region sequence comprising all three CDRs of VL number 1205 shown in Table I(2) and the amino acid sequence for “1204, heavy chain VH” is an example of a complete VH region sequence comprising all three CDRs of VH number 1204 shown in Table I(1).

Preferred anti-CD137 antibodies of the invention include a VH region which comprises all three CDRs of a particular VH number and a VL region which comprises all three CDRs of a particular VL number. For example: an antibody may comprise all three CDRs of VH number 1204 and all three CDRs of VL number 1205. Such an antibody may be referred to as 1204/1205. Such an antibody may preferably comprise the corresponding complete VH and VL sequences of 1204 and 1205 as shown in Table H (SEQ ID NOs: 179 and 177).

An antibody may alternatively comprise all three CDRs of VH number 1214 and all three CDRs of VL number 1215. Such an antibody may be referred to as 1214/1215. Such an antibody may preferably comprise the corresponding complete VH and VL sequences of 1214 and 1215 as shown in Table H (SEQ ID NOs: 181 and 183).

An antibody may alternatively comprise all three CDRs of VH number 1618 and all three CDRs of VL number 1619. Such an antibody may be referred to as 1618/1619. Such an antibody may preferably comprise the corresponding complete VH and VL sequences of 1618 and 1619 as shown in Table H (SEQ ID NOs: 185 and 187).

An antibody may alternatively comprise all three CDRs of VH number 1620 and all three CDRs of VL number 1621. Such an antibody may be referred to as 1620/1621. Such an antibody may preferably comprise the corresponding complete VH and VL sequences of 1620 and 1621 as shown in Table H (SEQ ID NOs: 189 and 191)

An antibody may alternatively comprise all three CDRs of VH number 1626 and all three CDRs of VL number 1627. Such an antibody may be referred to as 1626/1627. Such an antibody may preferably comprise the corresponding complete VH and VL sequences of 1626 and 1627 as shown in Table H (SEQ ID NOs: 193 and 195)

The anti-CD137 antibody may bind to the same epitope as any of the specific anti-CD137 antibodies described herein. Preferably it binds to the same epitope as any one of the antibodies designated 1204/1205, 1214/1215, 1618/1619, 1620/1621, and 1626/1627.

Binding Domains for CTLA-4

The bispecific polypeptides of the invention may comprise a binding domain specific for CTLA-4.

CD86 and CD80 may be referred to herein as B7 proteins (B7-2 and B7-1 respectively). These proteins are expressed on the surface of antigen presenting cells and interact with the T cell receptors CD28 and CTLA-4. The binding of the B7 molecules to CD28 promotes T cell activation while binding of B7 molecules to CTLA-4 switches off the activation of the T cell. The interaction between the B7 proteins with CD28 and/or CTLA-4 constitutes a costimulatory signalling pathway which plays an important role in immune activation and regulation. Thus, the B7 molecules are part of a pathway, amenable to manipulation in order to uncouple immune inhibition, thereby enhancing immunity in patients.

The CD86 protein is a monomer and consists of two extracellular immunoglobulin superfamily domains. The receptor binding domain of CD86 has a typical IgV-set structure, whereas the membrane proximal domain has a C1-set like structure. The structures of CD80 and CD86 have been determined on their own or in complex with CTLA-4. The contact residues on the CD80 and CD86 molecules are in the soluble extracellular domain, and mostly located in the beta-sheets and not in the (CDR-like) loops.

SEQ ID NO: 3 is the amino acid sequence of the monomeric soluble extracellular domain of human wild-type CD86. This wild type sequence may optionally lack Alanine and Proline at the N terminus, i.e. positions 24 and 25. These amino acids may be referred to herein as A24 and P25 respectively.

A bispecific polypeptide of the invention may incorporate as a polypeptide binding domain a domain which is specific for CTLA-4, a “CTLA-4 binding domain”. Suitable examples of such binding domains are disclosed in WO 2014/207063, the contents of which are incorporated by reference. The binding domain specific for CTLA-4 may also bind to CD28. The term CTLA-4 as used herein typically refers to human CTLA-4 and the term CD28 as used herein typically refers to human CD28. The sequences of human CTLA-4 and human CD28 are set out in SEQ ID NOs: 1 and 2 respectively. The CTLA-4 binding domain of the polypeptide of the present invention may have some binding affinity for CTLA-4 or CD28 from other mammals, for example primate or murine CTLA-4 or CD28.

The CTLA-4 binding domain has the ability to bind to CTLA-4 in its native state and in particular to CTLA-4 localised on the surface of a cell.

“Localised on the surface of a cell” is as defined above.

The CTLA-4 binding domain part of the polypeptide of the invention may comprise or consist of:

-   -   (i) the amino acid sequence of SEQ ID NO: 3; or     -   (ii) an amino acid sequence in which at least one amino acid is         changed when compared to the amino acid sequence of SEQ ID NO: 3         provided that said binding domain binds to human CTLA-4 with         higher affinity than wild-type human CD86.

In other words, the CTLA-4 binding domain is a polypeptide binding domain specific for human CTLA-4 which comprises or consists of (i) the monomeric soluble extracellular domain of human wild-type CD86, or (ii) a polypeptide variant of said soluble extracellular domain, provided that said polypeptide variant binds to human CTLA-4 with higher affinity than wild-type human CD86.

Accordingly, the CTLA-4 binding domain of the polypeptide of the invention may have the same target binding properties as human wild-type CD86, or may have different target binding properties compared to the target binding properties of human wild-type CD86. For the purposes of comparing such properties, “human wild-type CD86” typically refers to the monomeric soluble extracellular domain of human wild-type CD86 as described in the preceding section.

Human wild-type CD86 specifically binds to two targets, CTLA-4 and CD28. Accordingly, the binding properties of the CTLA-4 binding domain of the polypeptide of the invention may be expressed as an individual measure of the ability of the polypeptide to bind to each of these targets. For example, a polypeptide variant of the monomeric extracellular domain of human wild-type CD86 preferably binds to CTLA-4 with a higher binding affinity than that of wild-type human CD86 for CTLA-4. Such a polypeptide may optionally also bind to CD28 with a lower binding affinity than that of wild-type human CD86 for CD28.

The CTLA-4 binding domain of the polypeptide of the invention is a polypeptide binding domain specific for CTLA-4. This means that it binds to CTLA-4 preferably with a greater binding affinity than that at which it binds to another molecule. The CTLA-4 binding domain preferably binds to CTLA-4 with the same or with a higher affinity than that of wild-type human CD86 for CTLA-4.

Preferably, the Kd of the CTLA-4 binding domain of the polypeptide of the invention for human CTLA-4 will be at least 2-fold, at least 2.5-fold, at least 3-fold, at least 3.5-fold, at least 4-fold, at least 4.5-fold, at least 5-fold, at least 5.5-fold, at least 8-fold or at least 10-fold less than the Kd of wild-type human CD86 for human CTLA-4. Most preferably, the Kd of the CTLA-4 binding domain for human CTLA-4 will be at least 5-fold or at least 10-fold less than the Kd of wild-type human CD86 for human CTLA-4. A preferred method for determining the Kd of a polypeptide for CTLA-4 is SPR analysis, e.g. with a Biacore™ system. Suitable protocols for the SPR analysis of polypeptides are set out in the Examples.

Preferably, the EC50 of the CTLA-4 binding domain of the polypeptide of the invention for human CTLA-4 will be at least 1.5-fold, at least 2-fold, at least 3-fold, at least 5-fold, at least 10-fold, at least 12-fold, at least 14-fold, at least 15-fold, at least 17-fold, at least 20-fold, at least 25-fold or at least 50-fold less than the EC50 of wild-type human CD86 for human CTLA-4 under the same conditions. Most preferably, the EC50 of the CTLA-4 binding domain for human CTLA-4 will be at least 10-fold or at least 25-fold less than the EC50 of wild-type human CD86 for human CTLA-4 under the same conditions. A preferred method for determining the EC50 of a polypeptide for CTLA-4 is via ELISA. Suitable ELISA assays for use in the assessment of the EC50 of polypeptides are set out in the Examples.

Preferably, the IC50 of the CTLA-4 binding domain of the polypeptide of the invention when competing with wild-type human CD86 for binding to human CTLA-4 will be at least 2-fold, at least 3-fold, at least 4-fold, at least 5-fold, at least 10-fold, at least 13-fold, at least 15-fold, at least 50-fold, at least 100-fold, or at least 300-fold less than the IC50 of wild-type human CD86 under the same conditions. Most preferably, the IC50 of the CTLA-4 binding domain will be at least 10-fold or at least 300-fold less than the IC50 of wild-type human CD86 under the same conditions. A preferred method for determining the IC50 of a polypeptide of the invention is via ELISA. Suitable ELISA assays for use in the assessment of the IC50 of polypeptides of the invention are set out in the Examples.

The CTLA-4 binding domain of the polypeptide of the invention may also bind specifically to CD28. That is, the CTLA-4 binding domain may bind to CD28 with greater binding affinity than that at which it binds to another molecule, with the exception of CTLA-4. The CTLA-4 binding domain may bind to human CD28 with a lower affinity than that of wild-type human CD86 for human CD28. Preferably, the Kd of the CTLA-4 binding domain for human CD28 will be at least 2-fold, preferably at least 5-fold, more preferably at least 10-fold higher than the Kd of wild-type human CD86 for human CD28.

The binding properties of the CTLA-4 binding domain of the polypeptide of the invention may also be expressed as a relative measure of the ability of a polypeptide to bind to the two targets, CTLA-4 and CD28. That is, the binding properties of the CTLA-4 binding domain may be expressed as a relative measure of the ability of the polypeptide to bind to CTLA-4 versus its ability to bind to CD28. Preferably the CTLA-4 binding domain has an increased relative ability to bind to CTLA-4 versus CD28, when compared to the corresponding relative ability of human wild-type CD86 to bind to CTLA-4 versus CD28.

When the binding affinity of a polypeptide for both CTLA-4 and CD28 is assessed using the same parameter (e.g. Kd, EC50), then the relative binding ability of the polypeptide for each target may be expressed as a simple ratio of the values of the parameter for each target. This ratio may be referred to as the binding ratio or binding strength ratio of a polypeptide. For many parameters used to assess binding affinity (e.g. Kd, EC50), a lower value indicates a higher affinity. When this is the case, the ratio of binding affinities for CTLA-4 versus CD28 is preferably expressed as a single numerical value calculated according to the following formula: Binding ratio=[binding affinity for CD28]÷[binding affinity for CTLA-4]

Alternatively, if binding affinity is assessed using a parameter for which a higher value indicates a higher affinity, the inverse of the above formula is preferred. In either context, the CTLA-4 binding domain of the polypeptide of the invention preferably has a higher binding ratio than human wild-type CD86. It will be appreciated that direct comparison of the binding ratio for a given polypeptide to the binding ratio for another polypeptide typically requires that the same parameters be used to assess the binding affinities and calculate the binding ratios for both polypeptides.

Preferably, the binding ratio for a polypeptide is calculated by determining the Kd of the polypeptide for each target and then calculating the ratio in accordance with the formula [Kd for CD28]÷[Kd for CTLA-4]. This ratio may be referred to as the Kd binding ratio of a polypeptide. A preferred method for determining the Kd of a polypeptide for a target is SPR analysis, e.g. with a Biacore™ system. Suitable protocols for the SPR analysis of polypeptides of the invention are set out in the Examples. The binding ratio of the CTLA-4 binding domain of the polypeptide of the invention calculated according to this method is preferably at least 2-fold or at least 4-fold higher than the binding ratio of wild-type human CD86 calculated according to the same method.

Alternatively, the binding ratio for a polypeptide may be calculated by determining the EC50 of the polypeptide for each target and then calculating the ratio in accordance with the formula [EC50 for CD28]÷[EC50 for CTLA-4]. This ratio may be referred to as the EC50 binding ratio of a polypeptide. A preferred method for determining the EC50 of a polypeptide for a target is via ELISA. Suitable ELISA assays for use in the assessment of the EC50 of polypeptides of the invention are set out in the Examples. The binding ratio of the CTLA-4 binding domain of the polypeptide of the invention calculated according to this method is at least 2-fold, at least 3-fold, at least 4-fold, at least 5-fold, at least 6-fold, at least 7-fold, at least 8-fold, at least 9-fold or at least 10-fold higher than the binding ratio of wild-type human CD86 calculated according to the same method.

The CTLA-4 binding domain of the polypeptide of the invention may have the ability to cross-compete with another polypeptide for binding to CTLA-4. For example, the CTLA-4 binding domain may cross-compete with a polypeptide having the amino acid sequence of any one of SEQ ID NOs: 6 to 24 for binding to CTLA-4. Such cross-competing polypeptides may be identified in standard binding assays. For example, SPR analysis (e.g. with a Biacore™ system), ELISA assays or flow cytometry may be used to demonstrate cross-competition.

In addition to the above functional characteristics, the CTLA-4 binding domain of the polypeptide of the invention has certain preferred structural characteristics. The CTLA-4 binding domain either comprises or consists of (i) the monomeric soluble extracellular domain of human wild-type CD86, or (ii) a polypeptide variant of said soluble extracellular domain, provided that said polypeptide variant binds to human CTLA-4 with higher affinity than wild-type human CD86.

A polypeptide variant of the monomeric soluble extracellular domain of human wild-type CD86 comprises or consists of an amino acid sequence which is derived from that of human wild-type CD86, specifically the amino acid sequence of the soluble extracellular domain of human wild-type CD86 (SEQ ID NO: 3), optionally lacking A24 and P25. In particular, a variant comprises an amino acid sequence in which at least one amino acid is changed when compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). By “changed” it is meant that at least one amino acids is deleted, inserted, or substituted compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). By “deleted” it is meant that the at least one amino acid present in the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25) is removed, such that the amino acid sequence is shortened by one amino acid. By “inserted” it is meant that the at least one additional amino acid is introduced into the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25), such that the amino acid sequence is lengthened by one amino acid. By “substituted” it is meant that the at least one amino acid in the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25) is replaced with an alternative amino acid.

Typically, at least 1, 2, 3, 4, 5, 6, 7, 8 or 9 amino acids are changed when compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). Typically, no more than 10, 9, 8, 7, 6, 5, 4, 2 or 1 amino acids are changed when compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). It will be appreciated that any of these lower limits may be combined with any of these upper limits to define a range for the permitted number of changes compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). Thus, for example, a polypeptide of the invention may comprise an amino acid sequence in which the permitted number of amino acid changes compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25) is in the range 2 to 3, 2 to 4, 2 to 5, 2 to 6, 2 to 7, 2 to 8, 2 to 9, 2 to 10, 3 to 4, 3 to 5, 3 to 6, and so on.

It is particularly preferred that at least 2 amino acids are changed when compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). Preferably, the permitted number of amino acid changes compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25) is in the range 2 to 9, 2 to 8 or 2 to 7.

The numbers and ranges set out above may be achieved with any combination of deletions, insertions or substitutions compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). For example, there may be only deletions, only insertions, or only substitutions compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25), or any mixture of deletions, insertions or substitutions. Preferably the variant comprises an amino acid sequence in which all of the changes compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25) are substitutions. That is, a sequence in which no amino acids are deleted or inserted compared to the sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). In the amino acid sequence of a preferred variant, 1, 2, 3, 4, 5, 6, 7, or 8 amino acids are substituted when compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25) and no amino acids are deleted or inserted compared to the sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25).

Preferably the changes compared to the sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25) are in the FG loop region (positions 114 to 121) and/or the beta sheet region of SEQ ID NO: 3. The strands of the beta sheet region have the following positions in SEQ ID NO: 3: A:27-31, B:36-37, C:54-58, C′:64-69, C″:72-74, D:86-88, E:95-97, F:107-113, G:122-133.

Most preferably, the changes compared to the sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25) are in one or more of the positions selected from 32, 48, 49, 54, 74, 77, 79, 103, 107, 111, 118, 120, 121, 122, 125, 127 or 134. All numbering of amino acid positions herein is based on counting the amino acids in SEQ ID NO: 4 starting from the N terminus. Thus, the first position at the N terminus of SEQ ID NO: 3 is numbered 24 (see schematic diagram in FIG. 4).

Particularly preferred insertions include a single additional amino acid inserted between positions 116 and 117 and/or a single additional amino acid inserted between positions 118 and 119. The inserted amino acid is preferably Tyrosine (Y), Serine (S), Glycine (G), Leucine (L) or Aspartic Acid (D).

A particularly preferred substitution is at position 122, which is Arginine (R). The polypeptide of the invention preferably includes an amino acid sequence in which at least position 122 is substituted compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). The most preferred substitution at position 122 is to replace Arginine (R) with Lysine (K) or Asparagine (N), ranked in order of preference. This substitution may be referred to as R122K/N.

Other preferred substitutions are at positions 107, 121, and 125, which are Leucine (L), Isoleucine (I) and Glutamic acid (Q), respectively. In addition to the substitution at position 122, the polypeptide of the invention preferably includes an amino acid sequence in which at least one of the amino acids at positions 107, 121 and 125 is also substituted compared to the amino acid sequence of SEQ ID NO: 3 (or said sequence lacking A24 and P25). The amino acid sequence of the polypeptide of the invention may also be substituted at one or more of positions 32, 48, 49, 54, 64, 74, 77, 79, 103, 111, 118, 120, 127 and 134.

The most preferred substitution at position 107 is to replace Leucine (L) with Isoleucine (I), Phenylalanine (F) or Arginine (R), ranked in order of preference. This substitution may be referred to as L1071/F/R. Similar notation is used for other substitutions described herein. The most preferred substitution at position 121 is to replace Isoleucine (I) with Valine (V). This substitution may be referred to as I121V.

The most preferred substitution at position 125 is to replace Glutamine (Q) with Glutamic acid (E). This substitution may be referred to as Q125E.

Other substitutions which may be preferred in the amino acid sequence of the polypeptide of the invention include: F32I, Q48L, S49T, V54I, V64I, K74I/R, S77A, H79D/S/A, K103E, I111V, T118S, M120L, N127S/D and A134T.

Particularly preferred variants of said soluble extracellular domain of human wild-type CD86 comprise or consist of any one of the amino acid sequences of SEQ ID NOs: 6 to 24, as shown in Table C.

The amino acid sequences shown in SEQ ID NOs: 6 to 14 may optionally include the additional residues AP at the N-terminus. The amino acid sequences shown in SEQ ID NOs: 15 to 24 may optionally lack the residues AP at the N-terminus. In either case, these residues correspond to A24 and P25 of SEQ ID NO: 3.

The CTLA-4 binding domain of the polypeptide of the invention may comprise or consist of any of the above-described variants of said soluble extracellular domain of human wild-type CD86. That is, the CTLA-4 binding domain of the polypeptide of the invention may comprise or consist of the amino acid sequence of any one of SEQ ID NOs: 6 to 24, as shown in Table C.

The binding domain may modulate signalling from CTLA-4, for example when administered to a cell expressing CTLA-4, such as a T cell. Preferably the binding domain reduces, i.e. inhibits or blocks, said signalling and thereby increases the activation of said cell. Changes in CTLA-4 signalling and cell activation as a result of administration of a test agent (such as the binding domain) may be determined by any suitable method. Suitable methods include assaying for the ability of membrane-bound CD86 (e.g. on Raji cells) to bind and signal through CTLA-4 expressed on the surface of T cells, when in the presence of a test agent or in the presence of a suitable control. An increased level of T cell IL-2 production or an increase in T cell proliferation in the presence of the test agent relative to the level of T cell IL-2 production and/or T cell proliferation in the presence of the control is indicative of reduced signalling through CTLA-4 and increased cell activation. A typical assay of this type is disclosed in Example 9 of US20080233122.

Binding Domains for OX40

The bispecific binding molecules of the invention may incorporate as a binding domain (for example, as B1) any OX40 binding domain, for example an anti-OX40 antibody.

The antibody, or antigen binding fragment thereof, that binds specifically to OX40 has certain preferred binding characteristics and functional effects, which are explained in more detail below. Said antibody, or antigen binding fragment thereof, preferably retains these binding characteristics and functional effects when incorporated as part of a bispecific antibody of the invention. This binding domain may also be provided independently of the bispecific molecules of the invention.

The antibody preferably specifically binds to OX40, i.e. it binds to OX40 but does not bind, or binds at a lower affinity, to other molecules. The term OX40 as used herein typically refers to human OX40. The sequence of human OX40 is set out in SEQ ID NO:51 (corresponding to GenBank: NP_003318.1). The antibody may have some binding affinity for OX40 from other mammals, such as OX40 from a non-human primate (for example Macaca fascicularis (cynomolgus monkey), Macaca mulatta). The antibody preferably does not bind to murine OX40 and/or does not bind to other human TNFR superfamily members, for example human CD137 or CD40.

The antibody has the ability to bind to OX40 in its native state and in particular to OX40 localised on the surface of a cell. Preferably, the antibody will bind specifically to OX40. That is, an antibody of the invention will preferably bind to OX40 with greater binding affinity than that at which it binds to another molecule.

“Localised on the surface of a cell” is as defined above.

The antibody may modulate the activity of a cell expressing OX40, wherein said modulation is an increase or decrease in the activity of said cell, as defined above. The cell is typically a T cell. The antibody may increase the activity of a CD4+ or CD8+ effector cell, or may decrease the activity of a regulatory T cell (T reg), as described above.

In either case, the net effect of the antibody will be an increase in the activity of effector T cells, particularly CD4+ effector T cells. Methods for determining a change in the activity of effector T cells are well known and are described above.

The antibody preferably binds to human OX40 with a Kd value which is less than 50×10⁻¹⁰M or less than 25×10⁻¹⁰M, more preferably less than 10, 9, 8, 7, or 6×10⁻¹⁰M, most preferably less than 5×10⁻¹⁰M.

For example, the antibody preferably does not bind to murine OX40 or any other TNFR superfamily member, such as CD137 or CD40. Therefore, typically, the Kd for the antibody with respect to human OX40 will be 2-fold, preferably 5-fold, more preferably 10-fold less than Kd with respect to the other, non-target molecule, such as murine OX40, other TNFR superfamily members, or any other unrelated material or accompanying material in the environment. More preferably, the Kd will be 50-fold less, even more preferably 100-fold less, and yet more preferably 200-fold less.

The value of this dissociation constant can be determined directly by well-known methods, as described above.

An antibody of the invention is preferably capable of binding to its target with an affinity that is at least two-fold, 10-fold, 50-fold, 100-fold or greater than its affinity for binding to another non-target molecule.

In summary therefore, the antibody preferably exhibits at least one of the following functional characteristics:

-   -   I. binding to human OX40 with a K_(D) value which is less than         10×10⁻¹⁰M;     -   II. does not bind to murine OX40;     -   III. does not bind to other human TNFR superfamily members, for         example human CD137 or CD40.

The antibody is specific for OX40, typically human OX40 and may comprise any one, two, three, four, five or all six of the following:

-   -   (a) a heavy chain CDR1 sequence which is 8 amino acids in length         and comprises the consensus sequence: “G, F, T, F, G/Y/S, G/Y/S,         Y/S, Y/S/A”;     -   (b) a heavy chain CDR2 sequence which is 8 amino acids in length         and comprises the consensus sequence: “I, G/Y/S/T, G/S/Y, S/Y,         G/S/Y, G/S/Y, G/S/Y, T”;     -   (c) a heavy chain CDR3 sequence which is 9 to 17 amino acids in         length and which comprises the consensus sequence of: “A, R,         G/Y/S/H, G/Y/F/V/D, G/Y/P/F, −/H/S, −/N/D/H, −/Y/G, −/Y, −/Y,         −/W/A/V, −/A/Y, −/D/A/Y/G/H/N, Y/S/W/A/T, UM/I/F, D, Y”.         Preferred heavy chain CDR3 sequences within this definition         include a CDR3 sequence of 10 amino acids in length which         comprises the consensus sequence “A, R, Y/H, D, Y, A/Y/G, S/W/A,         M/L, D, Y” or a CDR3 sequence of 11 amino acids in length which         comprises the consensus sequence “A, R, G/Y, V/F/Y, P, H, G/Y/H,         Y, F/I, D, Y”;     -   (d) a light chain CDR1 sequence which consists of the sequence:         “Q, S, I, S, S, Y”;     -   (e) a light chain CDR2 sequence which consists of the sequence:         “A, A, S”;     -   (f) a light chain CDR3 sequence which is 8 to 10 amino acids in         length and comprises the consensus sequence: “Q,Q, S/Y/G,         −/Y/H/G, −/S/Y/G/D, S/Y/G/D, S/Y/G/T, P/L, Y/S/H/L/F, T”. A         preferred example a light chain CDR3 sequence within this         definition consists of the sequence “Q, Q, S, Y, S, T, P, Y, T”

The antibody may comprise at least a heavy chain CDR3 as defined in (c) and/or a light chain CDR3 as defined in (f). The antibody may comprise all three heavy chain CDR sequences of (a), (b) and (c) and/or all three light chain CDR sequences of (d), (e) and (f).

Exemplary CDR sequences are recited in tables A(1) and A(2), SEQ ID NOs: 52 to 88.

Preferred anti-OX40 antibodies may comprise at least a heavy chain CDR3 as defined in any individual row of Table A(1) and/or a light chain CDR3 as defined in in any individual row of Table A(2). The antibody may comprise all three heavy chain CDR sequences shown in an individual row of Table A(1) (that is, all three heavy chain CDRs of a given “VH number”) and/or all three light chain CDR sequences shown in an individual row of Table A(2) (that is, all three light chain CDRs of a given “VL number”).

Examples of complete heavy and light chain variable region amino acid sequences are shown in Table B. Exemplary nucleic acid sequences encoding each amino acid sequence are also shown. The numbering of said VH and VL regions in Table B corresponds to the numbering system used as in Table A(1) and (2). Thus, for example, the amino acid sequence for “1167, light chain VL” is an example of a complete VL region sequence comprising all three CDRs of VL number 1167 shown in Table A(2) and the amino acid sequence for “1166, heavy chain VH” is an example of a complete VH region sequence comprising all three CDRs of VH number 1166 shown in Table A(1).

Preferred anti-OX40 antibodies of the invention include a VH region which comprises all three CDRs of a particular VH number and a VL region which comprises all three CDRs of a particular VL number. For example:

-   -   an antibody may comprise all three CDRs of VH number 1166 and         all three CDRs of VL number 1167. Such an antibody may be         referred to as 1166/1167. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1166         and 1167 as shown in Table B (SEQ ID NOs: 91 and 89).     -   an antibody may comprise all three CDRs of VH number 1170 and         all three CDRs of VL number 1171. Such an antibody may be         referred to as 1170/1171. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1170         and 1171 as shown in Table B (SEQ ID NOs: 95 and 93).     -   an antibody may comprise all three CDRs of VH number 1164 and         all three CDRs of VL number 1135. Such an antibody may be         referred to as 1164/1135. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1164         and 1135 as shown in Table B (SEQ ID NOs: 99 and 97)     -   an antibody may comprise all three CDRs of VH number 1168 and         all three CDRs of VL number 1135. Such an antibody may be         referred to as 1168/1135. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1168         and 1135 as shown in Table B (SEQ ID NOs: 101 and 97)     -   an antibody may comprise all three CDRs of VH number 1482 and         all three CDRs of VL number 1483. Such an antibody may be         referred to as 1482/1483 Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1482         and 1483 as shown in Table B (SEQ ID NOs: 105 and 103).     -   an antibody may comprise all three CDRs of VH number 1490 and         all three CDRs of VL number 1135. Such an antibody may be         referred to as 1490/1135. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1490         and 1135 as shown in Table B (SEQ ID NOs: 107 and 97).     -   an antibody may comprise all three CDRs of VH number 1514 and         all three CDRs of VL number 1515. Such an antibody may be         referred to as 1514/1515. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1514         and 1515 as shown in Table B (SEQ ID NOs: 111 and 109).     -   an antibody may comprise all three CDRs of VH number 1520 and         all three CDRs of VL number 1135. Such an antibody may be         referred to as 1520/1135. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1520         and 1135 as shown in Table B (SEQ ID NOs: 113 and 97).     -   an antibody may comprise all three CDRs of VH number 1524 and         all three CDRs of VL number 1525. Such an antibody may be         referred to as 1524/1525. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1524         and 1525 as shown in Table B (SEQ ID NOs: 117 and 115).     -   an antibody may comprise all three CDRs of VH number 1526 and         all three CDRs of VL number 1527. Such an antibody may be         referred to as 1526/1527. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1526         and 1527 as shown in Table B (SEQ ID NOs: 121 and 119).     -   an antibody may comprise all three CDRs of VH number 1542 and         all three CDRs of VL number 1135. Such an antibody may be         referred to as 1542/1135. Such an antibody may preferably         comprise the corresponding complete VH and VL sequences of 1542         and 1135 as shown in Table B (SEQ ID NOs: 123 and 97).

The antibody may comprise a variant or a fragment of any of the specific amino acid sequences recited in Table B, provided that the antibody binds to human OX40 and exhibits at least one of functional characteristics I to III. Such a variant or fragment may typically retain the CDR sequences of the said sequence of Table B.

A fragment of any one of the heavy or light chain amino acid sequences shown in Table B may comprise at least 7, at least 8, at least 9, at least 10, at least 12, at least 15, at least 18, at least 20, least 25, at least 50, at least 60, at least 70, at least 80, at least 90 or at least 100 consecutive amino acids from the said amino acid sequence.

A variant of any one of the heavy or light chain amino acid sequences shown in Table B may be a substitution, deletion or addition variant of said sequence, as defined above.

The antibody may bind to the same epitope as any of the specific antibodies described herein. Preferably it binds to the same epitope as any one of the antibodies designated 1166/1167, 1170/1171, 1164/1135, 1168/1135, 1482/1483, 1490/1135, 1514/1515, 1520/1135, 1524/1525, 1526/1527 and 1542/1135.

Exemplary heavy chain constant region amino acid sequences which may be combined with any VH region sequence disclosed herein (to form a complete heavy chain), such as the IgG1 heavy chain constant region sequence, are described above.

Exemplary light chain constant region amino acid sequences which may be combined with any VL region sequence disclosed herein (to form a complete light chain), such as the kappa chain constant region sequence, are described above.

Embodiment of the Invention: Bispecific Polypeptide Specific for CTLA-4 and CD137

In an embodiment of the first aspect of the invention, the bispecific polypeptide has binding domains which are specific for CD137 and CTLA-4, for example B1 is specific for CD137 and B2 is specific for CTLA-4.

These binding domains are as defined above.

The Bispecific Polypeptide of the Embodiment Part B1—Binding Domain Specific for CD137

The binding domain specific for CD137 is as defined above.

The Bispecific Polypeptide of the Embodiment Part B2—Binding Domain Specific for CTLA-4

The binding domain specific for CTLA-4 is as defined above.

The Bispecific Polypeptide of the Embodiment

The bispecific polypeptide of the invention is capable of specifically binding to both human CD137 and human CTLA-4. By “capable of specifically binding to both CD137 and CTLA-4”, it is meant that the anti-CTLA-4 part specifically binds to CTLA-4 and the anti-CD137 part specifically binds to CD137, in accordance with the definitions provided for each part above. The bispecific polypeptide may comprise any CD137 binding domain as described herein linked to any CTLA-4 binding domain as described herein. Preferably the binding characteristics of the different parts for their respective targets are unchanged or substantially unchanged when they are present as part of a bispecific antibody of the invention, when compared to said characteristics for the individual parts when present as separate entities.

Typically this means that the bispecific molecule will have a Kd for CTLA-4 which is preferably substantially the same as the Kd value for CTLA-4 of the CTLA-4 binding domain when present alone. Alternatively, if the bispecific molecule has a Kd for CTLA-4 which is increased relative to the Kd for CTLA-4 of the CTLA-4 binding domain when present alone, then the increase is by no more than 10 fold, preferably no more than 9 fold, 8 fold, 7 fold, 6 fold, 5 fold, 4 fold, 3 fold or 2 fold. In addition, the bispecific molecule will independently have a Kd for CD137 which is preferably substantially the same as the Kd value for C137 of the CD137 binding domain when present alone. Alternatively, if the bispecific molecule has a Kd for CD137 which is increased relative to the Kd for CD137 of the anti-CD137 antibody when present alone, then the increase is by no more than 10 fold, preferably no more than 9 fold, 8 fold, 7 fold, 6 fold, 5 fold, 4 fold, 3 fold or 2 fold. Preferred Kd values for the individual binding domains are as described above.

It will be appreciated that any of the fold changes in CTLA-4 binding may be independently combined with any of the recited fold changes in CD137 binding to describe the binding characteristics of a given bispecific molecule.

The binding characteristics for CD137 or CTLA-4 of any bispecific polypeptide of the invention may be assessed by any suitable assay. In particular, the assays set out above for each separate part may also be applied to a bispecific antibody or a combined assay to assess simultaneous binding to both targets may be used. Suitable assays for assessing the binding characteristics of bispecific polypeptides of the invention are also set out in the Examples.

The bispecific polypeptide of the embodiment is capable of modulating the activity of cells of the immune system to a greater extent than an individual agonist of CD137 or CTLA-4 alone, or than a combination of such individual agonists. In particular, administration of the bispecific polypeptide produces a higher level of T cell activity, in particular effector T cell activity, for example CD4+ effector T cell activity. The increase in effector T cell activity is also more localised than that which results from administration of an individual CD137 or CTLA-4 agonist alone (or a combination thereof), because the bispecific polypeptide exerts the greatest effect only in a microenvironment in which CTLA-4 and CD137 are both highly expressed. Tumours are such a microenvironment. CD137 is expressed in high levels on CD8 T cells and may thus activate them in particular. CD8 T cells are one of the main effector component of an effective tumor response.

The increase in effector T cell activity may result directly from stimulation of the effector T cells via activation of the CD137 pathway or via blockade of the CTLA-4 inhibition pathway, or may result indirectly from depletion or down-regulation of Tregs, thereby reducing their immunosuppressive effect. Depletion/down-regulation of Tregs may be mediated by antibody dependent cellular phagocytosis (ADCP) or antibody dependent cellular cytotoxicity (ADCC) mechanisms. Overall, the result will be a very powerful, localised immune activation for the immediate generation of tumoricidal activity.

The cell surface expression pattern of CTLA-4 and CD137 is partly overlapping, thus, the bispecific antibodies of the invention may bind to both targets both in cis and in trans. This may result in stimulation through CD137 and CTLA-4 in a FcγR-cross-linking independent manner, either by increasing the level of receptor clustering in cis on the same cell, or by creating an artificial immunological synapse between two cells in trans, which in turn may lead to enhanced receptor clustering and increased signalling in both cells. Overall, the result will be a very powerful, tumor directed immune activation for the generation of tumoricidal activity.

Measurement of the effect of a bispecific polypeptide of the invention on cells of the immune system may be achieved with any suitable assay. For example, increased activity of effector T cells may be measured by assays as described above in respect of individual components B1 and B2 of the bispecific polypeptide, and include measurement of proliferation or IL-2 production by CD4+ and/or CD8+ T cells in the presence of the bispecific polypeptide relative to a control. An increase of proliferation or IL-2 production relative to control is indicative of increased cell activation. A typical assay of this type is disclosed in Example 9 of US20080233122. Assays for cell proliferation and/or IL-2 production are well known and are also exemplified in the Examples. When assessed in the same assay, the bispecific molecule will typically induce an increase in the activity of an effector T cell which is at least 1.5 fold higher or at least 2 fold higher, more preferably 3 fold higher, most preferably 5 fold higher than the increase in activity of an effector T cell induced by a combination of monospecific agents binding to the same targets.

The bispecific molecule potently activates the immune system when in a microenvironment in which both CD137 and CTLA-4 are highly expressed. Typically, the bispecific molecule will increase the activity of a CD4+ or CD8+ effector cell, or may decrease the activity of a regulatory T cell (T reg). In either case, the net effect of the antibody will be an increase in the activity of effector T cells, particularly CD4+ effector T cells. When assessed in the same assay, the bispecific molecule will typically induce an increase in the activity of an effector T cell which is at least 1.5 fold higher or at least 1.7 fold higher, more preferably 4.5 fold higher, most preferably 7 fold higher than the increase in activity of an effector T cell induced by a combination of monospecific agents binding to the same targets.

Methods for determining a change in the activity of effector T cells are well known and are as described earlier. Assays for cell proliferation and/or IL-2 production are well known and are exemplified in the Examples.

For example, the polypeptide may be capable of specifically binding to both CTLA-4 and CD137, and B1 may be an antibody, or antigen binding fragment thereof, specific for CD137; and B2 may be a polypeptide binding domain specific for CTLA-4, which comprises or consists of:

-   -   i) the amino acid sequence of SEQ ID NO: 3; or     -   ii) an amino acid sequence in which at least one amino acid is         changed when compared to the amino acid sequence of SEQ ID NO: 3         provided that said binding domain binds to human CTLA-4 with         higher affinity than wild-type human CD86.

The CTLA-4 specifically bound by the polypeptide may be primate or murine, preferably human, CTLA-4, and/or the CD137 specifically bound by the polypeptide may be primate, preferably human, CD137.

Part B1 of the polypeptide of the invention is an antibody, or antigen-binding fragment thereof, which typically comprises at least one heavy chain (H) and/or at least one light chain (L). Part B2 of the polypeptide of the invention may be attached to any part of B1, but may typically be attached to said at least one heavy chain (H) or at least one light chain (L), preferably at either the N or the C terminus. Part B2 of the polypeptide of the invention may be so attached either directly or indirectly via any suitable linking molecule (a linker).

Part B1 preferably comprises at least one heavy chain (H) and at least one light chain (L) and part B2 is preferably attached to the N or the C terminus of either said heavy chain (H) or said light chain (L). An exemplary antibody of B1 consists of two identical heavy chains (H) and two identical light chains (L). Such an antibody is typically arranged as two arms, each of which has one H and one L joined as a heterodimer, and the two arms are joined by disulfide bonds between the H chains. Thus, the antibody is effectively a homodimer formed of two H-L heterodimers. Part B2 of the polypeptide of the invention may be attached to both H chains or both L chains of such an antibody, or to just one H chain, or just one L chain.

The polypeptide of the invention may therefore alternatively be described as an anti-CD137 antibody, or an antigen binding fragment thereof, to which is attached at least one polypeptide binding domain specific for CTLA-4, which comprises or consists of the monomeric soluble extracellular domain of human wild-type CD86 or a variant thereof.

The binding domains of B1 and B2 may be the only binding domains in the polypeptide of the invention.

The polypeptide of the invention may comprise a polypeptide arranged according to any one of the following formulae, written in the direction N-C:

-   -   (A) L-(X)n-B2;     -   (B) B2-(X)n-L;     -   (C) B2-(X)n-H;     -   (D) H-(X)n-B2;

wherein H is the heavy chain of an antibody (i.e. of B1), L is the light chain of an antibody (i.e. of B1), X is a linker and n is 0 or 1. Where the linker (X) is a peptide, it typically has the amino acid sequence SGGGGSGGGGS(SEQ ID NO: 47), SGGGGSGGGGSAP (SEQ ID NO: 48), NFSQP (SEQ ID NO:49), KRTVA (SEQ ID NO: 50) or (SG)m, where m=1 to 7. Schematic representations of formulae (A) to (D) are shown in FIG. 1.

The present invention also provides a polypeptide which consists of a polypeptide arranged according to any of formulae (A) to (D). Said polypeptide may be provided as a monomer or may be present as a component of a multimeric protein, such as an antibody. Said polypeptide may be isolated. Examples of amino acid sequences of such polypeptides are shown in Table H. Exemplary nucleic acid sequences encoding each amino acid sequence are also shown. Exemplary amino acid and nucleotide sequences are recited in SEQ ID NOs 197-206.

Part B2 may be attached to any part of a polypeptide of the invention, or to a linker, by any suitable means. For example, the various parts of the polypeptide may be joined by chemical conjugation, such as with a peptide bond. Thus the polypeptide of the invention may comprise or consist of a fusion protein comprising B1 (or a component part thereof) and B2, optionally joined by a peptide linker. In such a fusion protein, the CD137-binding domain or domains of B1 and the CTLA-4-binding domain or domains of B2 may be the only binding domains.

Other methods for conjugating molecules to polypeptides are known in the art. For example, carbodiimide conjugation (see Bauminger & Wilchek, 1980, Methods Enzymol. 70:151-159; the disclosures of which are incorporated herein by reference) may be used to conjugate a variety of agents, including doxorubicin, to antibodies or peptides. The water-soluble carbodiimide, 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) is particularly useful for conjugating a functional moiety to a binding moiety. As a further example, conjugation may be achieved by sodium periodate oxidation followed by reductive alkylation of appropriate reactants, or by glutaraldehyde cross-linking. However, it is recognised that, regardless of which method is selected, a determination should preferably be made that parts B1 and B2 retain or substantially retain their target binding properties when present as parts of the polypeptide of the invention.

The same techniques may be used to link the polypeptide of the invention (directly or indirectly) to another molecule. The other molecule may be a therapeutic agent or a detectable label. Suitable therapeutic agents include a cytotoxic moiety or a drug.

A polypeptide of the invention may be provided in isolated or substantially isolated form. By substantially isolated, it is meant that there may be substantial, but not total, isolation of the polypeptide from any surrounding medium. The polypeptides may be mixed with carriers or diluents which will not interfere with their intended use and still be regarded as substantially isolated.

Exemplary polypeptides of the invention may comprise or consist of any one of the amino acid sequences shown in Table H.

Representative polynucleotides which encode examples of a heavy chain or light chain amino acid sequence of an antibody may comprise or consist of any one of the nucleotide sequences set out in Table H as SEQ ID NOs 178, 180, 182, 184, 186, 188, 190, 192, 194 or 196. Representative polynucleotides which encode the polypeptides shown in Table H may comprise or consist of the corresponding nucleotide sequences which are also shown in Table H (intron sequences are shown in lower case) (For example, SEQ ID NOs 197, 199, 201, 203 and 205). Representative polynucleotides which encode examples of part B2 may comprise or consist of any one of SEQ ID NOS: 25 to 43 as shown in Table E.

Embodiment of the Invention: Bispecific Polypeptide Specific for OX40 and CTLA-4

In an alternative embodiment of the first aspect of the invention the polypeptide has binding domains which are specific for OX40 and CTLA-4, for example B1 is specific for OX40 and B2 is specific for CTLA-4.

These binding domains are as defined above.

The Bispecific Polypeptide of the Embodiment Part B1—Antibody Specific for OX40

The binding domain specific for OX40 is as defined above.

The Bispecific Polypeptide of the Embodiment Part B2—Binding Domain Specific for CTLA-4

Part B2 of the polypeptide of the invention is a polypeptide binding domain specific for CTLA-4, as described above.

The Bispecific Polypeptide of the Embodiment

The bispecific polypeptide of the embodiment is capable of modulating the activity of cells of the immune system to a greater extent than an individual agonist of OX40 or CTLA-4 alone, or than a combination of such individual agonists. In particular, administration of the bispecific polypeptide produces a higher level of effector T cell activity, particular CD4+ effector T cell activity. The increase in effector T cell activity is also more localised than that which results from administration of an individual OX40 or CTLA-4 agonist alone (or a combination thereof), because the bispecific polypeptide exerts the greatest effect only in a microenvironment in which CTLA-4 and OX40 are both highly expressed. Tumours are such a microenvironment. Tumor infiltrating regulatory T cells (Tregs) express high levels of CTLA-4 and OX40, and higher than effector T cells (both CD4 and CD8).

The increase in effector T cell activity may result directly from stimulation of the effector T cells via activation of the OX40 pathway or via blockade of the CTLA-4 inhibition pathway, or may result indirectly from depletion or down-regulation of Tregs, thereby reducing their immunosuppressive effect. Depletion/down-regulation of Tregs may be mediated by antibody dependent cellular phagocytosis (ADCP) or antibody dependent cellular cytotoxicity (ADCC) mechanisms. The high expression of both CTLA-4 and OX40 on Tregs, compared to effector T cells, may induce a significantly higher killing of Tregs compared to the monospecific antibodies. Effector T cells, having lower expression of CTLA-4 and OX40 will not be depleted by this mechanism. Overall, the result will be a very powerful, localised immune activation for the immediate generation of tumoricidal activity.

Measurement of the effect of a bispecific polypeptide of the invention on cells of the immune system may be achieved with any suitable assay. For example, increased activity of effector T cells may be measured by assays as described above in respect of individual components B1 and B2 of the bispecific polypeptide, and include measurement of proliferation or IL-2 production by CD4+ and/or CD8+ T cells in the presence of the bispecific polypeptide relative to a control.

The bispecific polypeptide of the invention is capable of specifically binding to both human CTLA-4 and human OX40, and comprises B1 and B2 as defined above.

By “capable of specifically binding to both CTLA-4 and OX40”, it is meant that part B1 specifically binds to OX40 and part B2 specifically binds to CTLA-4, in accordance with the definitions provided for each part above. Preferably the binding characteristics of parts B1 and B2 for their respective targets are unchanged or substantially unchanged when they are present as part of a polypeptide of the invention, when compared to said characteristics for parts B1 and B2 when present as separate entities.

Typically this means that the bispecific molecule will have a Kd for OX40 which is preferably substantially the same as the Kd value for OX40 of B1 when present alone. Alternatively, if the bispecific molecule has a Kd for OX40 which is increased relative to the Kd for OX40 of B1 when present alone, then the increase is by no more than 10 fold, preferably no more than 9 fold, 8 fold, 7 fold, 6 fold, 5 fold, 4 fold, 3 fold or 2 fold. The bispecific molecule preferably binds to human OX40 with a Kd value which is less than 50×10⁻¹⁰M, more preferably less than 25×10⁻¹⁰M, most preferably less than 20×10⁻¹⁰M. In addition, the bispecific molecule will independently have a Kd for CTLA-4 which is preferably substantially the same as the Kd value for CTLA4 of B2 when present alone. Alternatively, if the bispecific molecule has a Kd for CTLA-4 which is increased relative to the Kd for CTLA-4 of B2 when present alone, then the increase is by no more than 3 fold, preferably no more than 2 fold. The bispecific molecule preferably binds to human CTLA-4 with a Kd value which is less than 60×10⁻⁹M, more preferably less than 25×10⁻⁹M, most preferably less than 10×10⁻⁹M.

In other words, the bispecific molecule may have a Kd for OX40 which is less than 50×10⁻¹⁰M, 25×10⁻¹⁰M, or 20×10⁻¹⁰M and independent have a Kd for CTLA-4 which is less than 60×10⁻⁹M, 25×10⁻⁹M, or 10×10⁻⁹M. It will be appreciated that any of the Kd values recited for OX40 may be independently combined with any of the Kd values recited for CTLA-4 to describe the binding characteristics of a given bispecific molecule. Similarly, any of the recited fold changes in OX40 binding may be independently combined with any of the recited fold changes in CTLA-4 binding to describe the binding characteristics of a given bispecific molecule.

The binding characteristics of parts B1 and B2 when present as part a polypeptide of the invention may be assessed by any suitable assay. In particular, the assays set out above for each separate part may also be applied to B1 and B2 when they are present as part of a polypeptide of the invention. Suitable assays for assessing the binding characteristics of bispecific polypeptides of the invention are also set out in the Examples.

The bispecific molecule potently activates the immune system when in a microenvironment in which both OX40 and CTLA-4 are highly expressed. Typically, the bispecific molecule will increase the activity of a CD4+ or CD8+ effector cell, or may decrease the activity of a regulatory T cell (T reg). In either case, the net effect of the antibody will be an increase in the activity of effector T cells, particularly CD4+ effector T cells. When assessed in the same assay, the bispecific molecule will typically induce an increase in the activity of an effector T cell which is at least 1.5 fold higher or at least 1.7 fold higher, more preferably 4.5 fold higher, most preferably 7 fold higher than the increase in activity of an effector T cell induced by a combination of monospecific agents binding to the same targets.

Methods for determining a change in the activity of effector T cells are well known and are as described earlier. Assays for cell proliferation and/or IL-2 production are well known and are exemplified in the Examples.

For example, the polypeptide may be capable of specifically binding to both CTLA-4 and OX40, and B1 may be an antibody, or antigen binding fragment thereof, specific for OX40; and B2 may be a polypeptide binding domain specific for CTLA-4, which comprises or consists of:

-   -   i) the amino acid sequence of SEQ ID NO: 3; or     -   ii) an amino acid sequence in which at least one amino acid is         changed when compared to the amino acid sequence of SEQ ID NO: 3         provided that said binding domain binds to human CTLA-4 with         higher affinity than wild-type human CD86.

The CTLA-4 specifically bound by the polypeptide may be primate or murine, preferably human, CTLA-4, and/or the OX40 specifically bound by the polypeptide may be primate, preferably human, OX40.

Part B1 of the polypeptide of the invention is an antibody, or antigen-binding fragment thereof, which typically comprises at least one heavy chain (H) and/or at least one light chain (L). Part B2 of the polypeptide of the invention may be attached to any part of B1, but may typically be attached to said at least one heavy chain (H) or at least one light chain (L), preferably at either the N or the C terminus. Part B2 of the polypeptide of the invention may be so attached either directly or indirectly via any suitable linking molecule (a linker).

Part B1 preferably comprises at least one heavy chain (H) and at least one light chain (L) and part B2 is preferably attached to the N or the C terminus of either said heavy chain (H) or said light chain (L). An exemplary antibody of B1 consists of two identical heavy chains (H) and two identical light chains (L). Such an antibody is typically arranged as two arms, each of which has one H and one L joined as a heterodimer, and the two arms are joined by disulfide bonds between the H chains. Thus, the antibody is effectively a homodimer formed of two H-L heterodimers. Part B2 of the polypeptide of the invention may be attached to both H chains or both L chains of such an antibody, or to just one H chain, or just one L chain.

The polypeptide of the invention may therefore alternatively be described as an anti-OX40 antibody, or an antigen binding fragment thereof, to which is attached at least one polypeptide binding domain specific for CTLA-4, which comprises or consists of the monomeric soluble extracellular domain of human wild-type CD86 or a variant thereof. The binding domains of B1 and B2 may be the only binding domains in the polypeptide of the invention.

The polypeptide of the invention may comprise a polypeptide arranged according to any one of the following formulae, written in the direction N-C:

-   -   (A) L-(X)n-B2;     -   (B) B2-(X)n-L;     -   (C) B2-(X)n-H; and     -   (D) H-(X)n-B2;

wherein H is the heavy chain of an antibody (i.e. of B1), L is the light chain of an antibody (i.e. of B1), X is a linker and n is 0 or 1. Where the linker (X) is a peptide, it typically has the amino acid sequence SGGGGSGGGGS (SEQ ID NO: 47), SGGGGSGGGGSAP (SEQ ID NO: 48), NFSQP (SEQ ID NO:49), KRTVA (SEQ ID NO: 50) or (SG)m, where m=1 to 7. Schematic representations of formulae (A) to (D) are shown in FIG. 1.

The present invention also provides a polypeptide which consists of a polypeptide arranged according to any of formulae (A) to (D). Said polypeptide may be provided as a monomer or may be present as a component of a multimeric protein, such as an antibody. Said polypeptide may be isolated. Examples of amino acid sequences of such polypeptides are shown in Table D. Exemplary nucleic acid sequences encoding each amino acid sequence are also shown.

Part B2 may be attached to any part of a polypeptide of the invention, or to a linker, by any suitable means. For example, the various parts of the polypeptide may be joined by chemical conjugation, such as with a peptide bond. Thus the polypeptide of the invention may comprise or consist of a fusion protein comprising B1 (or a component part thereof) and B2, optionally joined by a peptide linker. In such a fusion protein, the OX40-binding domain or domains of B1 and the CTLA-4-binding domain or domains of B2 may be the only binding domains.

Other methods for conjugating molecules to polypeptides are known in the art. For example, carbodiimide conjugation (see Bauminger & Wilchek, 1980, Methods Enzymol. 70:151-159; the disclosures of which are incorporated herein by reference) may be used to conjugate a variety of agents, including doxorubicin, to antibodies or peptides. The water-soluble carbodiimide, 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) is particularly useful for conjugating a functional moiety to a binding moiety. As a further example, conjugation may be achieved by sodium periodate oxidation followed by reductive alkylation of appropriate reactants, or by glutaraldehyde cross-linking. However, it is recognised that, regardless of which method is selected, a determination should preferably be made that parts B1 and B2 retain or substantially retain their target binding properties when present as parts of the polypeptide of the invention.

The same techniques may be used to link the polypeptide of the invention (directly or indirectly) to another molecule. The other molecule may be a therapeutic agent or a detectable label. Suitable therapeutic agents include a cytotoxic moiety or a drug.

A polypeptide of the invention may be provided in isolated or substantially isolated form. By substantially isolated, it is meant that there may be substantial, but not total, isolation of the polypeptide from any surrounding medium. The polypeptides may be mixed with carriers or diluents which will not interfere with their intended use and still be regarded as substantially isolated.

Exemplary polypeptides of the invention may comprise or consist of any one of the amino acid sequences shown in Table D. In one embodiment the polypeptide comprises or consists of the amino acid sequence selected of from within the group SEQ ID NOs 125 to 134, optionally wherein said polypeptide is a provided as a component part of an antibody.

Representative polynucleotides which encode examples of a heavy chain or light chain amino acid sequence of an antibody may comprise or consist of any one of the nucleotide sequences set out in Table B. Representative polynucleotides which encode the polypeptides shown in Table D may comprise or consist of the corresponding nucleotide sequences which are also shown in Table D (intron sequences are shown in lower case). Representative polynucleotides which encode examples of part B2 may comprise or consist of any one of SEQ ID NOS: 25 to 43 as shown in Table E.

Embodiment of the Invention: Bispecific Polypeptide for OX40 and CD137

In an alternative embodiment of the first aspect of the invention the polypeptide has binding domains which are specific for OX40 and CD137.

These binding domains are as described above.

The Bispecific Polypeptide of the Embodiment—Binding Domain Specific for OX40

The binding domain specific for OX40 is as defined above.

The Bispecific Polypeptide of the Embodiment—Binding Domain Specific for CD137

The binding domain specific for CD137 is as defined above, with the previously described functional and structural characteristics.

Preferably the antibody is 1204/1205, as previously defined, with reference to the sequences of Tables H and I. The anti-CD137 antibody may bind to the same epitope as any of the specific anti-CD137 antibodies described herein. Preferably it binds to the same epitope as the antibody designated 1204/1205.

The Bispecific Polypeptide of the Embodiment

The bispecific antibody of the invention is capable of specifically binding to both human CD137 and human OX40. By “capable of specifically binding to both CD137 and OX40”, it is meant that the anti-OX40 part specifically binds to OX40 and the anti-CD137 part specifically binds to CD137, in accordance with the definitions provided for each part above. The bispecific antibody may comprise any anti-CD137 antibody as described herein linked to any anti-OX40 antibody as described herein. Preferably the binding characteristics of the different parts for their respective targets are unchanged or substantially unchanged when they are present as part of a bispecific antibody of the invention, when compared to said characteristics for the individual parts when present as separate entities.

Typically this means that the bispecific molecule will have a Kd for OX40 which is preferably substantially the same as the Kd value for OX40 of the anti-OX40 antibody when present alone. Alternatively, if the bispecific molecule has a Kd for OX40 which is increased relative to the Kd for OX40 of the anti-OX40 antibody when present alone, then the increase is by no more than 10 fold, preferably no more than 9 fold, 8 fold, 7 fold, 6 fold, 5 fold, 4 fold, 3 fold or 2 fold. In addition, the bispecific molecule will independently have a Kd for CD137 which is preferably substantially the same as the Kd value for C137 of the anti-CD137 antibody when present alone. Alternatively, if the bispecific molecule has a Kd for CD137 which is increased relative to the Kd for CD137 of the anti-CD137 antibody when present alone, then the increase is by no more than 10 fold, preferably no more than 9 fold, 8 fold, 7 fold, 6 fold, 5 fold, 4 fold, 3 fold or 2 fold.

It will be appreciated that any of the fold changes in OX40 binding may be independently combined with any of the recited fold changes in CD137 binding to describe the binding characteristics of a given bispecific molecule.

The binding characteristics for CD137 or OX40 of any bispecific antibody of the invention may be assessed by any suitable assay. In particular, the assays set out above for each separate part may also be applied to a bispecific antibody or a combined assay to assess simultaneous binding to both targets may be used. Suitable assays for assessing the binding characteristics of bispecific polypeptides of the invention are also set out in the Examples.

The bispecific antibody of the invention is capable of modulating the activity of cells of the immune system to a greater extent than an individual agonist of OX40 or CD137 alone, or than a combination of such individual agonists. In particular, administration of the bispecific antibody produces a higher level of T cell activity. The increase in effector T cell activity is also more localised than that which results from administration of an individual OX40 or CD137 agonist alone (or a combination thereof), because the bispecific polypeptide exerts the greatest effect only in a microenvironment in which CD137 and OX40 are both highly expressed. Tumours are such a microenvironment.

The cell surface expression pattern of OX40 and CD137 is partly overlapping, thus, the bispecific antibodies of the invention may bind to both targets both in cis and in trans. This may result in stimulation through CD137 and OX40 in a FcγR-cross-linking independent manner, either by increasing the level of receptor clustering in cis on the same cell, or by creating an artificial immunological synapse between two cells in trans, which in turn may lead to enhanced receptor clustering and increased signalling in both cells. Overall, the result will be a very powerful, tumor directed immune activation for the generation of tumoricidal activity.

Measurement of the effect of a bispecific antibody of the invention on cells of the immune system may be achieved with any suitable assay. For example, increased activity of effector T cells may be measured by assays as described above in respect of the monospecific components of the bispecific antibody, and include measurement of proliferation or IL-2 production by CD4+ and/or CD8+ T cells in the presence of the bispecific antibody relative to a control. An increase of proliferation or IL-2 production relative to control is indicative of increased cell activation. A typical assay of this type is disclosed in Example 9 of US20080233122. Assays for cell proliferation and/or IL-2 production are well known and are also exemplified in the Examples. When assessed in the same assay, the bispecific molecule will typically induce an increase in the activity of an effector T cell which is at least 1.5 fold higher or at least 2 fold higher, more preferably 3 fold higher, most preferably 5 fold higher than the increase in activity of an effector T cell induced by a combination of monospecific agents binding to the same targets.

The invention provides a bispecific antibody comprising an antibody which specifically binds to OX40 (an anti-OX40 antibody) and an antibody which specifically binds to CD137 (an anti-CD137 antibody), joined to each other directly or indirectly. By “joined indirectly” it is meant that another moiety (a linker) links the anti-OX40 antibody to the anti-CD137 antibody. Exemplary linkers include a peptide of amino acid sequence as shown in any one of SEQ ID NOs. 47 to 50, or 144. The peptide of sequence GGGGSGGGGSGGGGS (SEQ ID NO: 144) is particularly preferred.

The anti-OX40 antibody may be attached to any part of the anti-CD137 antibody, or to a linker, by any suitable means. For example, the various parts of the polypeptide may be joined by chemical conjugation, such as with a peptide bond. Thus the polypeptide of the invention may comprise or consist of a fusion protein comprising an anti-OX40 antibody (or antigen binding fragment thereof) and an anti-CD137 antibody (or antigen binding fragment thereof), optionally joined by a peptide linker. In such a fusion protein, the CD137-binding domain or domains and the OX40-binding domain or domains may be the only binding domains present.

Other methods for conjugating molecules to polypeptides are known in the art. For example, carbodiimide conjugation (see Bauminger & Wilchek, 1980, Methods Enzymol. 70:151-159; the disclosures of which are incorporated herein by reference) may be used to conjugate a variety of agents, including doxorubicin, to antibodies or peptides. The water-soluble carbodiimide, 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) is particularly useful for conjugating a functional moiety to a binding moiety. As a further example, conjugation may be achieved by sodium periodate oxidation followed by reductive alkylation of appropriate reactants, or by glutaraldehyde cross-linking. However, it is recognised that, regardless of which method is selected, a determination should preferably be made that the anti-OX40 and anti-CD137 parts of the bispecific antibody retain or substantially retain their target binding properties when present as parts of the bispecific antibody of the invention.

The same techniques may be used to link any antibody of the invention (directly or indirectly) to another molecule. The other molecule may be a therapeutic agent or a detectable label. Suitable therapeutic agents include a cytotoxic moiety or a drug.

The bispecific antibody of the invention may comprise the anti-OX40 antibody (or antigen binding fragment thereof) and the anti-CD137 antibody (or antigen binding fragment thereof) arranged together in any suitable format. It will be appreciated that in any given bispecific format, the anti-OX40 antibody and the anti-CD137 antibody may each independently be a whole antibody or an antigen binding portion thereof. Irrespective of the particular bispecific format used, bispecific antibodies described herein may typically be referred to by a numbering scheme based on the composition of the OX40 binding domain (which may be referred to as binding domain 1) and the composition of the CD137 binding domain (which may be referred to as binding domain 2). The numbering scheme is therefore typically in the form VH1/VL1 for the OX40 binding domain (binding domain 1) and VH2/VL2 for the CD137 binding domain (binding domain 2), written together as VH1/VL1-VH2/VL2. Thus, for example, a bispecific antibody referred to as 1164/1135-1204/1205 comprises at least one OX40 binding domain which consists of the VH sequence 1164 and the VL sequence 1135 (i.e. 1164/1135=VH1/VL1), and at least one CD137 binding domain which consists of the VH sequence 1204 and the VL sequence 1205 (i.e. 1204/1205=VH2/VL2). It will be appreciated that this numbering scheme does not reflect the total number of binding domains present in the bispecific antibody nor the presence or absence of any constant regions in the bispecific antibody, both of which are determined by the particular format of bispecific antibody that is used. The total number of binding domains and the presence or absence of constant regions may be in accordance with any suitable bispecific antibody format known in the art.

Many suitable formats of bispecific antibody are known in the art and the bispecific antibody of the invention may be in any of these formats. Suitable formats include those described in FIGS. 1 and 19 (see also Kontermann & Brinkmann, 2015, Drug Discov Today. 838-847; the disclosures of which are incorporated herein by reference).

In FIG. 19, constant regions are shown as filled light grey; variable heavy chain region VH1 is shown as checkered black and white; variable light chain region VL1 is shown as filled white; variable heavy chain region VH2 is shown as filled black; and variable light chain region VL2 is shown as white with diagonal lines. Thus, OX40 binding domains (referred to as binding domain 1) are typically represented as a pair of a checkered black and white domain with a filled white domain; CD137 binding domains (referred to as binding domain 2) are typically represented as a pair of a filled black domain and a white domain with diagonal lines. However, in all of the formats shown, it will be appreciated that binding domains 1 and 2 may be switched. That is, an OX40 binding domain may occur in any position shown in FIG. 19 for a CD137 domain, and vice versa.

A preferred format for the bispecific antibody is a kih or “knob-in-hole” arrangement, which is the first shown in the second row of FIG. 19. In this arrangement, the CH3 domain of the heavy chain of each antibody is mutated to allow heterodimerisation between a heavy chain from the anti-OX40 antibody and a heavy chain from the anti-CD137 antibody. Each heavy chain associates with its corresponding light chain to form one complete OX40 binding domain and one complete CD137 binding domain. Modifications may be made to the heavy chain CH1 regions to promote association with the correct light chain. Kih format bispecific antibodies are well-known in the art. See for example Ridgway et al 1996; Protein Eng 9:617-621, the disclosures of which are incorporated herein by reference.

Another preferred format for the bispecific antibody of the invention is scFv₂-Fc format, which is the second shown in the second row of FIG. 19. In this arrangement, one scFv specific for each target is fused to constant immunoglobulin domains. The single chains may be fused to the Fc region of the heavy chain, with one specificity fused to the N-terminal end and the other specificity fused to the C-terminal end of the Fc region (Park et al., 2000, Mol Immunol 37(18):1123-30; the disclosures of which are incorporated herein by reference).

Another preferred format for the bispecific antibody of the invention is the BITE/scFv₂ format which is the third format shown in the second row of FIG. 19. In this arrangement two scFv, one specific for OX40 and the other specific for CD137, are fused together with a linker (Brischwein et al., 2007, J Immunother 30(8):798-807; the disclosures of which are incorporated herein by reference). The linker may optionally include a protein that increases solubility and serum half-life, such as human serum albumin (HSA), creating scFv-HSA-scFv bispecific antibodies, as shown in the fourth row of FIG. 19.

Another preferred format for the bispecific antibody of the invention is double variable domain (DVD) immunoglobulins, which is the fourth format shown in the second row of FIG. 19. In this arrangement the second variable domain (VL2) is fused to the first variable light chain (VL1), and the second variable heavy chain (VH2) is fused to the first variable heavy chain (VH1) of an IgG molecule. VH1 and VL1 form binding site 1 and VH2 and VL2 form binding site 2, thus creating a bispecific antibody (Wu, 2007, Nat Biotechnol 25(11):1290-7; the disclosures of which are incorporated herein by reference).

Another preferred format for the bispecific antibody of the invention is the Dual affinity retargeting (DART) format in which the VH1 is fused to VL2 and VH2 fused to VL1 with a short peptide linker forcing them to form VH1/VL1 and VH2/VL2 binding sites. This construct may be stabilized by formation of a disulphide bridge between the binding sites. The DART format may be fused to IgG Fc domains, creating monovalent bispecific antibodies (DART-Fc) or bivalent bispecific antibodies (DART₂-Fc) (Moore et al., 2011, Blood 117(17):4542-51). The DART, DART-Fc and DART₂-Fc formats are shown in the third row of FIG. 19.

Another preferred format for the bispecific antibody of the invention is bispecific antibodies generated by the dock and lock technology (DNL). cAMP dependent protein kinase A and A kinase anchoring protein can be fused to antibodies, Fab fragments or scFv for each target, thereby generating multivalent bispecific antibodies, e.g. DNL-Fab₃ (Chang et al., 2007, Clin Cancer Res 13(18 Pt 2):5586s-5591s, as shown in the fourth row of FIG. 19; the disclosures of which are incorporated herein by reference).

A particularly preferred format for the bispecific antibody of the invention is the scFv-IgG format. Four different possible arrangements of this format are shown in the top row of FIG. 19. As shown in FIG. 19, in scFv-IgG format the anti-OX40 antibody is a whole IgG molecule and the anti-CD137 antibody is an scFv antibody connected to the anti-OX40 antibody at any one of four general locations (heavy chain constant region; light chain constant region; heavy chain variable region; light chain variable region). In each case, the reverse arrangement is also envisaged. That is, with the anti-CD137 antibody as a whole IgG and the anti-OX40 antibody as an scFv connected to the anti-CD137 antibody at any one of the four general locations. In the scFv-IgG format, the whole IgG molecule may be joined directly to the scFv or may be joined indirectly via a linker. Exemplary linkers include a peptide of amino acid sequence as shown in any one of SEQ ID NOs. 47 to 50, or 144, with the peptide of sequence GGGGSGGGGSGGGGS (SEQ ID NO: 144) particularly preferred.

In the first scFv-IgG arrangement shown in FIG. 19 (top left of the Figure) the bispecific antibodies comprise two copies of a polypeptide chain which comprises the heavy chain variable sequence VH1 (checkered black and white), linked to a heavy chain constant sequence (Hc; filled grey), linked (optionally via a linker) to an scFv sequence consisting of the heavy chain variable sequence VH2 (filled black) and the light chain variable sequence VL2 (white with diagonal lines). This chain may be referred to as VH1-Hc-VH2/VL2 (ordered N terminus-C terminus). The bispecific antibody also comprises two copies of a smaller chain which comprises the light chain variable sequence VL1 (filled white) linked to a light chain constant sequence (Lc; filled grey), which may be referred to as VL1-Lc (ordered N terminus-C terminus). The alternative scFv-IgG arrangements shown in FIG. 19 also comprise two copies each of two different chains, which may be described in similar fashion. Thus, reading from left to right in the top row of FIG. 22, the second arrangement comprises two VH1-Hc chains and two VL1-Lc-VH2/VL2 chains. The third arrangement comprises two VH1/VH2-VH1-Hc chains and two VL1-Lc chains. The fourth arrangement comprises two VH1-Hc and two VH1/VH2-VL1-Lc chains.

The most preferred scFv-IgG format for bispecific antibodies of the invention is the first scFv-IgG arrangement shown in FIG. 19 (top left of the Figure). Exemplary amino acid sequences for polypeptide chains of the type VH1-Hc-VH2/VL2 from this scFv-IgG arrangement are shown in Table F and are used in the bispecific molecules of the Examples. In each case, for the amino acid sequences the underlined/bold sequence is VH1, the italic sequence is the heavy chain constant sequence Hc (typically an IgG1 constant domain in the sequences shown, but this may be replaced with any suitable IgG constant domain such as those disclosed herein), the underlined sequence is an optional linker, the bold sequence is VH2 and the bold italic sequence is VL2. Corresponding exemplary nucleotide sequences encoding the polypeptide chains are also shown in Table F. The nucleotide sequences include introns. Exemplary amino acid sequences for polypeptide chains of the type VL1-Lc from this scFv-IgG arrangement are shown in Table G and are used in the bispecific molecules of the Examples. In each case, for the amino acid sequences the underlined/bold sequence is VL1 and the italic sequence is the light chain constant sequence Lc (typically kappa, but may be replaced with any suitable light chain constant region). Corresponding exemplary nucleotide sequences encoding the polypeptide chains are also shown in Table G.

The present invention provides a polypeptide comprising or consisting of any of the amino acid sequences set out in Tables F and G, either alone or, preferably as part of a monospecific or bispecific antibody. In all of the sequences shown in Tables F and G, the sequences corresponding to heavy or light chain constant regions are exemplary and may be replaced with any other suitable heavy or light chain constant region sequence. Preferred heavy and light chain constant region sequences are those of SEQ ID NOs: 135, 136, 137, 138 and 139.

A bispecific or monospecific antibody of the invention may be provided in isolated or substantially isolated form. By substantially isolated, it is meant that there may be substantial, but not total, isolation of the polypeptide from any surrounding medium. The polypeptides may be mixed with carriers or diluents which will not interfere with their intended use and still be regarded as substantially isolated.

An antibody of the invention may be produced by any suitable means. For example, all or part of the antibody may be expressed as a fusion protein by a cell comprising a nucleotide which encodes said polypeptide.

Alternatively the individual parts may be produced separately and then subsequently joined together. Joining may be achieved by any suitable means, for example using the chemical conjugation methods and linkers outlined above. Separate production of individual parts may be achieved by any suitable means. For example by expression from separate nucleotides optionally in separate cells, as is explained in more detail below.

Representative polynucleotides which encode all or part of an antibody of the invention may comprise or consist of any one of the nucleotide sequences set out in Tables B, F, G and H. A suitable polynucleotide may alternatively be a variant of any of these sequences, as defined above.

FURTHER ASPECTS OF THE INVENTION

A second aspect of the invention comprises a bispecific polypeptide according to the first aspect of the invention for use in a method for treating or preventing a disease or condition in an individual, as described above.

A third aspect of the invention is a method of treating or preventing a disease or condition in an individual, the method comprising administering to an individual a bispecific polypeptide according to the first or second aspects of the invention, as described above.

One embodiment of the invention is a bispecific polypeptide according to the second aspect of the invention or a method according to third aspect of the invention wherein the disease or condition is cancer and optionally wherein the individual is human.

In a further embodiment, the method comprises administering the bispecific antibody systemically or locally, such as at the site of a tumour or into a tumour draining lymph node, as described above.

The cancer may be prostate cancer, breast cancer, colorectal cancer, pancreatic cancer, ovarian cancer, lung cancer, cervical cancer, rhabdomyosarcoma, neuroblastoma, multiple myeloma, leukemia, acute lymphoblastic leukemia, melanoma, bladder cancer, gastric cancer, head and neck cancer, liver cancer, skin cancer, lymphoma or glioblastoma.

A fourth aspect of the invention is a polynucleotide encoding at least one polypeptide chain of a bispecific polypeptide according to the first or second aspects of the invention, as described above.

A fifth aspect of the invention is a composition comprising a bispecific polypeptide according to the first or second aspects of the invention and at least one pharmaceutically acceptable diluent or carrier.

In one embodiment of the invention a polypeptide according to either the first or second aspect of the embodiment is conjugated to an additional therapeutic moiety.

A sixth aspect of the invention is an antibody specific for CD137 which is as defined earlier.

EMBODIMENTS OF THE INVENTION

Embodiments of the invention are described in the following paragraphs:

1. A polypeptide capable of specifically binding to both CTLA-4 and OX40, said polypeptide comprising B1 and B2, wherein:

B1 is an antibody, or antigen binding fragment thereof, specific for OX40; and

B2 is a polypeptide binding domain specific for CTLA-4, which comprises or consists of:

-   -   i) the amino acid sequence of SEQ ID NO: 3; or     -   ii) an amino acid sequence in which at least one amino acid is         changed when compared to the amino acid sequence of SEQ ID NO: 3         provided that said binding domain binds to human CTLA-4 with         higher affinity than wild-type human CD86.

2. A polypeptide according to paragraph 1 in which the CTLA-4 specifically bound by the polypeptide is primate or murine, preferably human, CTLA-4, and/or wherein the OX40 specifically bound by the polypeptide is primate, preferably human, OX40.

3. A polypeptide according to paragraph 1 or 2 in which B1 comprises at least one heavy chain (H) and/or at least one light chain (L) and B2 is attached to said at least one heavy chain (H) or least one light chain (L).

4. A polypeptide according to paragraph 3 in which B1 comprises:

-   -   at least one heavy chain (H) and at least one light chain (L)         and B2 is attached to either the heavy chain or the light chain;         or     -   two identical heavy chains (H) and two identical light         chains (L) and B2 is attached to both heavy chains or to both         light chains.

5. A polypeptide according to any one of the preceding paragraphs which comprises or consists of a polypeptide chain arranged according to any one of the following formulae, written in the direction N-C:

-   -   (A) L-(X)n-B2;     -   (B) B2-(X)n-L;     -   (C) B2-(X)n-H;     -   (D) H-(X)n-B2;

wherein X is a linker and n is 0 or 1.

6. A polypeptide according to paragraph 5, wherein X is a peptide with the amino acid sequence SGGGGSGGGGS (SEQ ID NO: 47), SGGGGSGGGGSAP (SEQ ID NO: 48), NFSQP (SEQ ID NO:49), KRTVA (SEQ ID NO: 50) or (SG)m, where m=1 to 7.

7. A polypeptide according to any one of the preceding paragraphs, which binds to human OX40 with a Kd of less than 50×10⁻¹⁰M, 25×10⁻¹⁰M, or 20×10⁻¹⁰M and/or which binds to human CTLA-4 with a Kd value which is less than 60×10⁻⁹M, 25×10⁻⁹M, or 10×10⁻⁹M.

8. A polypeptide according to any one of the preceding paragraphs, which induces an increase in the activity of an effector T cell, preferably a CD4+ effector T cell, optionally wherein said increase is at least 1.5 fold, 4.5 fold or 7 fold higher than the increase in activity of an effector T cell induced by a combination of B1 and B2 administered to the T cell as separate molecules.

9. A polypeptide according to paragraph 8, wherein said increase in T cell activity is an increase in proliferation and/or IL-2 production by the T cell.

10. A polypeptide according to any one of the preceding paragraphs, wherein 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acids in said amino acid sequence of B2 (ii) are substituted when compared to the amino acid sequence of SEQ ID NO: 3; optionally wherein there are no insertions or deletions compared to the amino acid sequence of SEQ ID NO: 3.

11. A polypeptide according to paragraph 10, wherein at least one of said amino acid substitutions in said amino acid sequence of said first binding domain is at position 122, and optionally wherein said amino acid sequence is also substituted in at least one of positions 107, 121 and 125.

12. A polypeptide according to any one of the preceding paragraphs wherein said amino acid sequence of B2 comprises or consists of an amino acid sequence selected from any one of SEQ ID NOs 8, 6, 7 and 9 to 24.

13. A polypeptide according to any one of the preceding paragraphs, wherein B1 exhibits at least one of the following functional characteristics when present independently of B2:

-   -   I. binding to human OX40 with a K_(D) value which is less than         10×10⁻¹⁰M, more preferably less than 5×10⁻¹⁰M;     -   II. does not bind to murine OX40; and does not bind to other         human TNFR superfamily members, for example human CD137 or CD40

14. A polypeptide according to any one of the preceding paragraphs, wherein B1 comprises any one, two, three, four, five or all six features independently selected from the following:

-   -   (a) a heavy chain CDR1 sequence which is 8 amino acids in length         and comprises the consensus sequence: “G, F, T, F, G/Y/S, G/Y/S,         Y/S, Y/S/A”;     -   (b) a heavy chain CDR2 sequence which is 8 amino acids in length         and comprises the consensus sequence: “I, G/Y/S/T, G/S/Y, S/Y,         G/S/Y, G/S/Y, G/S/Y, T”;     -   (c) a heavy chain CDR3 sequence which is 9 to 17 amino acids in         length and which comprises the consensus sequence of: “A, R,         G/Y/S/H, G/Y/F/V/D, G/Y/P/F, −/H/S, −/N/D/H, −/Y/G, −/Y, −/Y,         −/W/A/V, −/A/Y, −/D/A/Y/G/H/N, Y/S/W/A/T, UM/I/F, D, Y”     -   (d) a light chain CDR1 sequence which consists of the sequence:         “Q, S, I, S, S, Y”;     -   (e) a light chain CDR2 sequence which consists of the sequence:         “A, A, S”;     -   (f) a light chain CDR3 sequence which is 8 to 10 amino acids in         length and comprises the consensus sequence: “Q,Q, S/Y/G,         −/Y/H/G, −/S/Y/G/D, S/Y/G/D, S/Y/G/T, P/L, Y/S/H/L/F, T”;

wherein the heavy chain CDR3 sequence of (c) is preferably a sequence of 10 amino acids in length which comprises the consensus sequence “A, R, Y/H, D, Y, A/Y/G, S/W/A, M/L, D, Y” or a CDR3 sequence of 11 amino acids in length which comprises the consensus sequence “A, R, G/Y, V/F/Y, P, H, G/Y/H, Y, F/I, D, Y”; and

the light chain CDR3 sequence of (f) preferably consists of the sequence “Q, Q, S, Y, S, T, P, Y, T”.

15. A polypeptide according to any one of the preceding paragraphs, wherein B1 comprises all three heavy chain CDR sequences of a VH sequence as shown in Table A(1) and/or all three light chain CDR sequences of a VL sequence as shown in Table A(2), or wherein B1 comprises a heavy chain VH sequence and/or a light chain VL sequence as shown in Table B.

16. A polypeptide according to any one of the preceding paragraphs, wherein B1 comprises a heavy chain CDR3 sequence of 11 amino acids in length which comprises the consensus sequence “A, R, G/Y, V/F/Y, P, H, G/Y/H, Y, F/I, D, Y”; and the light chain VL sequence of SEQ ID NO: 97 (1135 as shown in Table B), optionally wherein the light chain VL sequence of SEQ ID NO: 97 is present as part of the longer sequence of SEQ ID NO: 129 (1141 as shown in Table D).

17. A polypeptide according to any one of the preceding paragraphs, wherein B1 comprises an human Fc region or a variant of a said region, where the region is an IgG1, IgG2, IgG3 or IgG4 region, preferably an IgG1 or IgG4 region.

18. A polypeptide according to any one of the preceding paragraphs, which comprises or consists of the amino acid sequence of any one of SEQ ID NOs 125 to 134, optionally wherein said polypeptide is a provided as a component part of an antibody.

19. A polypeptide according to any one of the preceding paragraphs for use in a method for treating or preventing a disease or condition in an individual.

20. A method of treating or preventing a disease or condition in an individual, the method comprising administering to an individual a polypeptide according to any one of the preceding paragraphs.

21. A polypeptide according to paragraph 19 or a method according to paragraph 20, wherein the disease or condition is cancer and optionally wherein the individual is human.

22. A polypeptide or method according to paragraph 21, wherein the method comprises administering the polypeptide systemically or locally, such as at the site of a tumour or into a tumour draining lymph node.

23. A polypeptide or method according to paragraph 21 or 22 wherein the cancer is prostate cancer, breast cancer, colorectal cancer, pancreatic cancer, ovarian cancer, lung cancer, cervical cancer, rhabdomyosarcoma, neuroblastoma, multiple myeloma, leukemia, acute lymphoblastic leukemia, melanoma, bladder cancer, gastric cancer, head and neck cancer, liver cancer, skin cancer, lymphoma or glioblastoma.

24. A polynucleotide encoding a polypeptide according to any one of paragraphs 1 to 18.

25. A polypeptide according to any one of paragraphs 1 to 18 conjugated to an additional therapeutic moiety.

26. A composition comprising a polypeptide according to any one of paragraphs 1 to 18 and at least one pharmaceutically acceptable diluent or carrier.

Further distinct embodiments are described in the following paragraphs:

1. A bispecific antibody comprising an antibody which specifically binds to OX40 (an anti-OX40 antibody) and an antibody which specifically binds to CD137 (an anti-CD137 antibody), joined to each other directly or indirectly.

2. A bispecific antibody according to paragraph 1 in which the CD137 that is specifically bound is primate or murine, preferably human CD137, and/or wherein the OX40 that is specifically bound is primate, preferably human, OX40.

3. A bispecific antibody according to any one of the preceding paragraphs, which binds to human OX40 with a Kd of less than 50×10⁻¹⁰M, 25×10⁻¹⁰M, or 20×10⁻¹⁰M and/or which binds to human CD137 with a Kd value which is less than 10×10⁻⁹M, 4×10⁻⁹M, or 1.2×10⁻⁹M.

4. A bispecific antibody according to any one of the preceding paragraphs, which induces an increase in the activity of an effector T cell, optionally wherein said increase is at least 1.5 fold, 2 fold, 3 fold or 5 fold higher than the increase in activity of an effector T cell induced by a combination of the corresponding monospecific antibodies administered to the T cell as separate molecules.

5. A bispecific antibody according to paragraph 4, wherein said increase in T cell activity is an increase in proliferation and/or IL-2 production and/or IFN-γ production by the T cell, optionally wherein the T cell is a CD4+ or CD8+ T cell.

6. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-OX40 antibody and the anti-CD137 antibody are joined to each other indirectly via a linker which is a peptide of the amino acid sequence GGGGSGGGGSGGGGS (SEQ ID NO: 144), SGGGGSGGGGS(SEQ ID NO: 47), SGGGGSGGGGSAP (SEQ ID NO: 48), NFSQP (SEQ ID NO:49), KRTVA (SEQ ID NO: 50) or (SG)m, where m=1 to 7.

7. A bispecific antibody according to any one of the preceding paragraphs which is an scFv-IgG format bispecific antibody.

8. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-OX40 antibody exhibits at least one of the following functional characteristics when present independently of the anti-CD137 antibody:

-   -   I. binding to human OX40 with a K_(D) value which is less than         10×10⁻¹⁰M, more preferably less than 5×10⁻¹⁰M;     -   II. does not bind to murine OX40; and     -   III. does not bind to other human TNFR superfamily members, for         example human CD137 or CD40

9. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-OX40 antibody comprises any one, two, three, four, five or all six features independently selected from the following:

-   -   (a) a heavy chain CDR1 sequence which is 8 amino acids in length         and comprises the consensus sequence: “G, F, T, F, G/Y/S, G/Y/S,         Y/S, Y/S/A”;     -   (b) a heavy chain CDR2 sequence which is 8 amino acids in length         and comprises the consensus sequence: “I, G/Y/S/T, G/S/Y, S/Y,         G/S/Y, G/S/Y, G/S/Y, T”;     -   (c) a heavy chain CDR3 sequence which is 9 to 17 amino acids in         length and which comprises the consensus sequence of: “A, R,         G/Y/S/H, G/Y/F/V/D, G/Y/P/F, −/H/S, −/N/D/H, −/Y/G, −/Y, −/Y,         −/W/A/V, −/A/Y, −/D/A/Y/G/H/N, Y/S/W/A/T, UM/I/F, D, Y”     -   (d) a light chain CDR1 sequence which consists of the sequence:         “Q, S, I, S, S, Y”;     -   (e) a light chain CDR2 sequence which consists of the sequence:         “A, A, S”;     -   (f) a light chain CDR3 sequence which is 8 to 10 amino acids in         length and comprises the consensus sequence: “Q,Q, S/Y/G,         −/Y/H/G, −/S/Y/G/D, S/Y/G/D, S/Y/G/T, P/L, Y/S/H/L/F, T”;

wherein the heavy chain CDR3 sequence of (c) is preferably a sequence of 10 amino acids in length which comprises the consensus sequence “A, R, Y/H, D, Y, A/Y/G, S/W/A, M/L, D, Y” or a CDR3 sequence of 11 amino acids in length which comprises the consensus sequence “A, R, G/Y, V/F/Y, P, H, G/Y/H, Y, F/I, D, Y”; and

the light chain CDR3 sequence of (f) preferably consists of the sequence “Q, Q, S, Y, S, T, P, Y, T”.

10. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-OX40 antibody comprises all three heavy chain CDR sequences of a VH sequence as shown in Table A(1) and/or all three light chain CDR sequences of a VL sequence as shown in Table A(2), or wherein the anti-OX40 antibody comprises a heavy chain VH sequence and/or a light chain VL sequence as shown in Table B.

11. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-OX40 antibody comprises a heavy chain CDR3 sequence of 11 amino acids in length which comprises the consensus sequence “A, R, G/Y, V/F/Y, P, H, G/Y/H, Y, F/I, D, Y”; and the light chain VL sequence of SEQ ID NO: 97 (1135 as shown in Table B), optionally wherein the light chain VL sequence of SEQ ID NO: 97 is present as part of the longer sequence of SEQ ID NO: 129 (1141 as shown in Table D).

12. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-OX40 antibody when present independently of the anti-CD137 antibody competes for binding to OX40 with an anti-OX40 antibody as defined in any one of paragraphs 8 to 11.

13. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-CD137 antibody exhibits at least one of the following functional characteristics when present independently of the anti-OX40 antibody:

-   -   I. binding to human CD137 with a K_(D) value which is less than         2×10⁻⁹M, more preferably less than 1.2×10⁻⁹M; and     -   II. ability to cause an increase in activity in a CD8+ T cell in         vitro, optionally wherein said increase in activity is an         increase in proliferation and/or IL-2 production and/or IFN-γ         production by the T cell

14. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-CD137 antibody comprises all three heavy chain CDR sequences of a VH sequence as shown in the first row of Table I(1) and/or all three light chain CDR sequences of a VL sequence as shown in the first row of Table I(2), or wherein the anti-CD137 antibody comprises a heavy chain VH sequence and/or a light chain VL sequence as shown in Table H, SEQ ID NOs 177-180.

15. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-CD137 antibody when present independently of the anti-OX40 antibody competes for binding to CD137 with an anti-CD137 antibody as defined in paragraph 14.

16. A bispecific antibody according to any one of the preceding paragraphs, wherein the anti-OX40 and/or the anti-CD137 antibody comprises an human Fc region or a variant of a said region, where the region is an IgG1, IgG2, IgG3 or IgG4 region, preferably an IgG1 or IgG4 region.

17. A bispecific antibody according to any one of the preceding paragraphs, which comprises the amino acid sequence of any one of SEQ ID NOs 149, 151, 153, 155, 157, 159, 161 or 163.

18. A bispecific antibody according to any one of the preceding paragraphs which comprises the amino acid sequence of any one of SEQ ID Nos 165, 167, 169, 171 or 173.

19. A bispecific antibody according to any one of the preceding paragraphs which comprises the amino acid sequences of:

-   -   SEQ ID NO: 165 and any one of SEQ ID NOs: 149, 153, 159 and 163;         or     -   SEQ ID NO: 167 and SEQ ID NO 151; or     -   SEQ ID NO: 169 and SEQ ID NO: 155; or     -   SEQ ID NO: 171 and SEQ ID NO: 157; or     -   SEQ ID NO: 173 and SEQ ID NO: 161.

20. A bispecific antibody according to any one of the preceding paragraphs for use in a method for treating or preventing a disease or condition in an individual.

21. A method of treating or preventing a disease or condition in an individual, the method comprising administering to an individual a bispecific antibody according to any one of the preceding paragraphs.

22. A bispecific antibody according to paragraph 20 or a method according to paragraph 21 wherein the disease or condition is cancer and optionally wherein the individual is human.

23. A bispecific antibody or method according to paragraph 22, wherein the method comprises administering the bispecific antibody systemically or locally, such as at the site of a tumour or into a tumour draining lymph node.

24. A bispecific antibody or method according to paragraph 22 or 23 wherein the cancer is prostate cancer, breast cancer, colorectal cancer, pancreatic cancer, ovarian cancer, lung cancer, cervical cancer, rhabdomyosarcoma, neuroblastoma, multiple myeloma, leukemia, acute lymphoblastic leukemia, melanoma, bladder cancer, gastric cancer, head and neck cancer, liver cancer, skin cancer, lymphoma or glioblastoma.

25. A polynucleotide encoding at least one polypeptide chain of a bispecific antibody according to any one of paragraphs 1 to 20.

26. A composition comprising a bispecific antibody according to any one of paragraphs 1 to 20 and at least one pharmaceutically acceptable diluent or carrier.

27. An antibody specific for CD137 which is as defined in any one of paragraphs 13 to 15.

BRIEF DESCRIPTION OF THE FIGURES

Preferred, non-limiting examples which embody certain aspects of the invention will now be described, with reference to the following figures:

FIG. 1 shows a schematic representation of the structure of exemplary arrangements for the bispecific polypeptides of the invention. Anti-OX40 antibody variable domains are filled in black; constant domains in white. CTLA-A binding domains are shaded with diagonal lines.

FIG. 2 shows the CTLA-4 binding properties of CTLA-4 binding domains of polypeptides the invention as determined by an ELISA binding assay.

FIG. 3 shows the CTLA-4 binding properties of CTLA-4 binding domains of polypeptides of the invention as determined by an ELISA inhibition assay.

FIG. 4 provides a schematic representation of human wild-type CD86 amino acid sequences disclosed herein. (A) is the amino acid sequence of the monomeric soluble extracellular domain of human CD86 without N-terminal signal sequence (SEQ ID NO: 3); (B) is the amino acid sequence of the monomeric extracellular and transmembrane domains of human wildtype CD86, including N-terminal signal sequence (SEQ ID NO: 4); (C) is the full length amino acid sequence of human CD86 (Genbank ABK41931.1; SEQ ID NO: 44). The sequence in A may optionally lack Alanine and Proline at the N terminus, i.e. positions 24 and 25, shown in bold. Signal sequences in B and C are underlined. Numbering of amino acid positions is based on SEQ ID NOs: 4 and 44, starting from the N terminus.

FIG. 5 shows the results of an inhibition ELISA demonstrating that a CTLA-4 binding domains of polypeptides of the invention has binding affinity of a similar magnitude for both human and murine CTLA-4.

FIG. 6 is a plot of dissociation rate constant versus association rate constant for exemplary anti-OX40 antibodies, as determined by surface plasmon resonance.

FIG. 7 shows binding of exemplary anti-OX40 antibodies to human OX40 overexpressed on CHO cells, measured by flow cytometry.

FIG. 8 shows the level of IL-2 production by T cells when incubated in vitro with different exemplary anti-OX40 antibodies. The y-axis is the ratio of the top value of IL-2 production by a tested antibody/the top value of a reference antibody. Mean and SEM values from at least 4 donors are shown.

FIG. 9 shows results of an ELISA assay for binding of exemplary bispecific molecules to individual targets OX40 and CTLA4.

FIG. 10 shows results of surface plasmon resonance analysis of binding of exemplary bispecific molecules to both OX40 and CTLA4. The different bispecific antibodies were passed over the sensor (start indicated by I)). At near saturation of the surface, buffer was applied (II) and subsequently CTLA-4 (III) was passed over the sensor surface generating a second association phase, represented by the full line. After three minutes, buffer (IV) was applied, and the following dissociation phase reflects dissociation of both CTLA-4 and OX40 Ab. As a control, only buffer, with no CTLA-4 was added, represented by the dotted line.

FIG. 11 shows results of an ELISA assay showing binding of exemplary bispecific molecules to both OX40 and CTLA-4 simultaneously.

FIG. 12 shows the level of IL-2 production by T cells when incubated in vitro with different exemplary bispecific molecules in a titration series: A) 1164/1141 and 1166/1141 B) 1168/1141 and 1170/1263 C) 1514/1581 and 1520/1141 D) 1526/1585 and 1542/1141 or a combination of the two corresponding monospecific antibodies for each target (monoclonal OX40 antibodies or the CTLA-4-binding domain coupled to an isotype IgG antibody: 1756/1757). The assay was performed in U-shaped non-tissue cultured treated 96-well plates coated with CD3 (UCHT1) and CTLA-4 (Orencia). Mean out of 4 donors is presented.

FIG. 13 shows the level of IL-2 production by T cells when incubated in vitro with different exemplary bispecific molecules at 1.49 nM or a combination of the corresponding monospecific antibodies for each target (a-OX40 mAbs or the CTLA-4− domain coupled to an isotype antibody: 1756/1757). The assay was performed in U-shaped non-tissue cultured treated 96-well plates coated with anti-CD3 (UCHT1) with or without CTLA-4 (Orencia), indicated by + or −. Mean and SD out of 4 donors is presented.

FIG. 14 shows binding of exemplary anti-CD137 antibody 1204/1205 to human and cynomolgus monkey CD137 overexpressed on CHO cells, measured by flow cytometry.

FIG. 15 shows the normalized stimulation index of IFNγ production of exemplary anti-CD137 antibody 1204/1205 compared with reference antibody 111/112 in a CD8 T cell agonist assay.

FIG. 16 shows the level of IL-2 production by T cells when incubated in vitro with different exemplary bispecific molecules in a titration series: A) 1164/1135-1204/1205. B) 1166/1167-1204/1205, C) 1168/1135-1204/1205, D) 1170/1171-1204/1205, E) 1482/1483-1204/1205, F) 1520/1135-1204/1205, G) 1526/1527-1204/1205, H) 1542/1135-1204/1205; or a combination of the two corresponding monospecific antibodies for each target. An isotype control 1188/1187 (IgG1) is used as a negative control in all experiments. The cells were cultured for 72 h in U-shaped non-tissue cultured treated 96-well plates coated with anti-CD3 antibody (UCHT1). Mean IL-2 levels of 2 donors is presented.

FIG. 17 shows the level of IL-2 production by peripheral blood mononuclear cells when incubated in vitro with exemplary bispecific molecule 1164/1135-1204/1205 at 1 nM, compared to the corresponding monospecific antibodies for each target: anti-OX40 mAb 1164/1135 or mAb anti-CD137 1204/1205 or an isotype control 1188/1187 (IgG1). The cells were cultured for 48 h in U-shaped non-tissue cultured treated 96-well plates coated with anti-CD3 antibody (UCHT1). Mean IL-2 levels of 2 donors is presented.

FIG. 18 shows results of an ELISA assay showing binding of exemplary bispecific molecules to both OX40 and CD137 simultaneously.

FIG. 19 shows a schematic representation of the structure of exemplary formats for bispecific antibodies of the invention. In each format, the constant regions are shown as filled light grey; variable heavy chain regions VH1 are shown as checkered black and white; variable light chain regions VL1 are shown as filled white; variable heavy chain regions VH2 are shown as filled black; and variable light chain regions VL2 are shown as white with diagonal lines. OX40 binding domains (binding domain 1) are typically represented as a pair of a checkered black and white domain with a filled white domain (VH1/VL1); CD137 binding domains (binding domain 2) are typically represented as a pair of a filled black domain and a white domain with diagonal lines (VH2/VL2). However, in all of the formats shown, it will be appreciated that binding domains 1 and 2 may be switched. That is, an OX40 binding domain may occur in a position shown in this figure for a CD137 domain, and vice versa. Furthermore, binding domain 2 may occur in different variable heavy and light chain orders, i.e. either in VH2/VL2 or VL2/VH2 order.

FIG. 20 shows binding of the different CD137 antibodies to human CD137 and cynomolgus CD137 expressed on cells and measured by flow cytometry.

FIG. 21 shows an overview of human/mouse CD137 chimeras (mouse sequence=black lines, human sequence=white lines).

FIG. 22 shows the results from an example were the ability to block CD137L binding was evaluated. 100% binding reflects no blocking. Signals below 100% reflects blocking of the binding (antibody concentration from left to right 0.25, 2.5 and 25 μg/ml).

FIG. 23 shows the ability of monospecific CD137 antibodies to stimulate CD8 T cells as measured by IFNγ release.

FIG. 24 shows the results from a dual ELISA. CD137 was coated to an ELISA well and the bispecific antibody was added at different concentrations. Binding was detected using biotinylated CTLA-4.

FIG. 25 shows IFNγ levels in supernatants measured from human CD8 positive T cells stimulated with 1.5 nM CD137-CTLA4 bispecific antibodies or an isotype control with CTLA-4 binding only. The assay was performed on plates coated with CD3 with or without CTLA-4.

FIG. 26 shows full dilution curve of IFNγ levels in supernatants measured from human CD8 positive T cells stimulated with CD137-CTLA4 bispecific antibodies (at different concentrations) or an isotype control with CTLA-4 binding only. The assay was performed on plates coated with CD3 with CTLA-4.

FIG. 27 shows induction of ADCC at different concentration by monospecific CTLA-4 (Control IgG with CTLA-4 binding part, i.e. domain) and OX40 (1166/1167) binding molecules, alone and in combination, compared to ADCC induced by an exemplary bispecific antibody targeting CTLA-4 and OX40.

FIG. 28. CHO cells expressing both CTLA-4 and OX40 were stained with decreasing concentrations of 1166/1261, or the two monospecific binders 1166/1167 (OX40 specific monoclonal antibody) and control IgG with CTLA-4 binding part (monospecific CTLA4 binding IgG fusion protein) (200 nM-0,0034 nM), followed by PE-conjugated anti-human IgG. Fluorescence was detected using flow cytometry. ‘Ctr IgG’ is a negative isotype control.

FIG. 29. HEK-CTLA4 and CHO-OX40 were stained with PKH26 and PKH67 respectively and incubated with 1166/1261 or a combination of the two monospecific OX40 and CTLA-4 binding molecules (1166/1167 and Control IgG with CTLA-4 binding part). The percentage of double-positive/aggregated cells were quantified using flow cytometry (representative experiment).

FIG. 30. Plasma levels of the bispecific OX40-CTLA-4 antibody 1166/1261 and the monospecific OX40 antibody 1166/1167 measured at different time points following administration. Two different ELISA methods were used, ELISA-1, where OX40 was coated on the wells and anti-Fc was used to detect binding and ELISA-2, where OX40 was coated on the wells and biotinylated CTLA-4 was used for detection.

FIG. 31. HT-29 colon carcinoma cells (4×10⁶) were inoculated subcutaneously to the right hind flank/back at day 0. Human PBMC cells (7×10⁶) were administered intraperitoneally on the same day. The treatments were done by intraperitoneal injections (667 nmol/dose) on days 6, 13, and 20. N(mice)=5/donor, n(donor=4), pooled data from HT29 responders.

DESCRIPTION OF THE SEQUENCES

SEQ ID NO: 1 is the amino acid sequence of human CTLA-4 (corresponding to GenBank: AAD00698.1)

SEQ ID NO: 2 is the amino acid sequence of human CD28 (corresponding to GenBank: AAA51944.1)

SEQ ID NO: 3 is the amino acid sequence of the monomeric extracellular domain of human wildtype CD86, excluding a 23 amino acid signal sequence from the N terminus.

SEQ ID NO: 4 is the amino acid sequence of the monomeric extracellular and transmembrane domains of human wildtype CD86, including N-terminal signal sequence (see FIG. 4). All numbering of amino acid positions herein is based on the positions in SEQ ID NO: 4 starting from the N terminus. Thus, the Alanine at the N terminus of SEQ ID NO: 3 is numbered 24.

SEQ ID NO: 5 is the amino acid sequence of a mutant form of the extracellular domain of human CD86 disclosed in Peach et al (Journal of Biological Chemistry 1995, vol 270(36), 21181-21187). H at position 79 of the wild type sequence is substituted with A in the corresponding position for the sequence of SEQ ID NO: 5. This change is referred to herein as H79A. Equivalent nomenclature is used throughout for other amino acid substitutions referred to herein. Numbering of positions is based on SEQ ID NO: 4 as outlined above.

SEQ ID NOs: 6 to 24 are the amino acid sequences of specific proteins of the invention.

SEQ ID NOs: 25 to 43 are nucleotide sequences encoding the amino acid sequences of each of SEQ ID NOs 6 to 24, respectively

SEQ ID NO: 44 is the full length amino acid sequence of human CD86 (corresponding to GenBank: ABK41931.1)

SEQ ID NO: 45 is the amino acid sequence of murine CTLA-4 (corresponding to UniProtKB/Swiss-Prot: P09793.1).

SEQ ID NO: 46 is the amino acid sequence of murine CD28 (corresponding to GenBank: AAA37395.1).

SEQ ID NOs: 47 to 50 are various linkers which may be used in the bispecific polypeptides of the invention.

SEQ ID NO: 51 is the amino acid sequence of human OX40 (corresponding to GenBank: NP_003318.1)

SEQ ID NOs: 52 to 88 are exemplary CDR sequences of anti-OX40 antibodies disclosed herein.

SEQ ID NOs: 89 to 124 are exemplary amino acid and nucleotide sequences of the heavy and light chain variable regions of antibodies disclosed herein.

SEQ ID NOs: 125 to 134 are exemplary amino acid and nucleotide sequences of bispecific polypeptides disclosed herein.

SEQ ID NO: 135 is an exemplary heavy chain constant region amino acid sequence.

SEQ ID NO: 136 is an exemplary light chain constant region amino acid sequence.

SEQ ID NO: 137 is an exemplary modified human heavy chain IgG4 constant region sequence with a mutation from Ser to Pro in the hinge region (position 108) and from His to Arg in the CH3 region (position 315). Mutations result in reduced serum half-life and stabilization of the core hinge of IgG4 making the IgG4 more stable, preventing Fab arm exchange.

SEQ ID NO: 138 is an exemplary wild type human heavy chain IgG4 constant region sequence. That is a sequence lacking the mutations of SEQ ID NO: 137.

SEQ ID NO: 139 is an exemplary modified human heavy chain IgG4 constant region sequence with a single mutation from Ser to Pro in the hinge region (position 108). Mutation results in stabilization of the core hinge of IgG4 making the IgG4 more stable, preventing Fab arm exchange.

SEQ ID NO: 140 is an exemplary cDNA sequence (i.e. lacking introns) encoding the IgG4 constant region of SEQ ID NO: 137.

SEQ ID NO: 141 is an exemplary genomic DNA sequence (i.e. including introns) encoding the IgG4 constant region of SEQ ID NO: 137

SEQ ID NO: 142 is an exemplary cDNA sequence (i.e. lacking introns) encoding the IgG4 constant region of SEQ ID NO: 138.

SEQ ID NO: 143 is an exemplary genomic DNA sequence (i.e. including introns) encoding the IgG4 constant region of SEQ ID NO: 138.

SEQ ID NO 144 is a linker which may be used in the bispecific polypeptides of the invention.

SEQ ID NOs: 145 and 146 are exemplary cDNA and genomic DNA sequences, respectively, encoding the IgG1 constant region of SEQ ID NO: 135.

SEQ ID NOs: 147 is an exemplary DNA sequence encoding the light chain kappa region of SEQ ID NO: 136.

SEQ ID NO: 148 is the amino acid sequence of human CD137 (corresponding to GenBank: AAH06196.1)

SEQ ID NOs: 149 to 174 are amino acid and nucleotide sequences of exemplary bispecific antibodies disclosed herein.

SEQ ID NO: 175 is an exemplary cDNA sequence (i.e. lacking introns) encoding the IgG4 region of SEQ ID NO: 139.

SEQ ID NO: 176 is an exemplary genomic DNA sequence (i.e. including introns) encoding the IgG4 region of SEQ ID NO: 139.

SEQ ID NOs: 177 to 196 are exemplary amino acid and nucleotide sequences of the heavy and light chain variable regions of anti-CD137 antibodies disclosed herein.

SEQ ID NOs: 197 to 206 are exemplary bispecific polypeptides of the invention.

SEQ ID NOs 207 to 226 correspond to exemplary CDR sequences for CD137 binding domains (as do SEQ ID NOs 80 and 81)

Tables (Sequences)

TABLE A(1) Exemplary heavy chain CDR sequences (OX40 antibody) VH number SEQ H CDR1 SEQ H CDR2 SEQ H CDR3 1166 52 GFTFGGYY 60 ISGSGGST 69 ARYDYASMDY 1170 As 1166 61 IPGSGGST 70 ARYDYYWMDY 1164 58 GFTFYGSS 62 IYSSGGYT 71 ARGVPHGYFDY 1168 54 GFTFSGSS 63 ISYYGGYT 72 ARYFPHYYFDY 1482 55 GFTFSSYA 64 ISYYSGYT 73 ARGYGYLDY 1490 As 1482 As 1168 74 ARYYPHHYIDY 1514 56 GFTFGYYY 65 ISSYGSYT 75 ARSGYSNWANS FDY 1520 As 1482 As 1166 76 ARYYYSHGYYV YGTLDY 1524 57 GFTFGSYY 66 IGSYYGYT 77 ARHDYGALDY 1526 58 GFTFSGYS 67 IGYSGYGT 78 ARYYFHDYAAYS LDY 1542 59 GFTFGSSS 68 IGYYSYST 79 ARGYPHHYFDY S

TABLE A(2) Exemplary light chain CDR sequences (OX40 antibody) VL number SEQ L CDR1 SEQ L CDR2 SEQ L CDR3 1167 80 QSISSY 81 AAS 82 QQYYWYGLST 1171 As 1167 As 1167 83 QQGHGSYPHT 1135 As 1167 As 1167 84 QQSYSTPYT 1483 As 1167 As 1167 85 QQYGSLLT 1515 As 1167 As 1167 86 QQGDYTLFT 1525 As 1167 As 1167 87 QQYGPSGLFT 1527 As 1167 As 1167 88 QQYGSDSLLT

TABLE B Exemplary sequences (OX40 antibody) SEQ ID NO. CHAIN NO. TYPE SEQUENCE 89 1167, light chain aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN VL WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG SGTDFTLTISSLQPEDFATYYCQQYYWYGLSTF GQGTKLEIK 90 1167, light chain nt GACATCCAGATGACCCAGTCTCCATCCTCCC VL TGAGCGCATCTGTAGGAGACCGCGTCACCAT CACTTGCCGGGCAAGTCAGAGCATTAGCAGC TATTTAAATTGGTATCAGCAGAAACCAGGGAA AGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCA GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGTACTACTGGTAC GGTCTGTCCACTTTTGGCCAGGGGACCAAGC TGGAGATCAAA 91 1166, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFGGY chain VH YMSWVRQAPGKGLEWVSAISGSGGSTYYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARYDYASMDYWGQGTLVTVSS 92 1166, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTGGTGG TTACTACATGTCTTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCAGCTATTA GTGGTAGTGGTGGTAGCACATACTATGCAGA CTCCGTGAAGGGCCGGTTCACCATCTCCCGT GACAATTCCAAGAACACGCTGTATCTGCAAAT GAACAGCCTGCGTGCCGAGGACACGGCTGT ATATTATTGTGCGCGCTACGACTACGCTTCTA TGGACTATTGGGGCCAGGGAACCCTGGTCAC CGTCTCCTCA 93 1171, light chain aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN VL WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG SGTDFTLTISSLQPEDFATYYCQQGHGSYPHTF GQGTKLEIK 94 1171, light chain nt GACATCCAGATGACCCAGTCTCCATCCTCCC VL TGAGCGCATCTGTAGGAGACCGCGTCACCAT CACTTGCCGGGCAAGTCAGAGCATTAGCAGC TATTTAAATTGGTATCAGCAGAAACCAGGGAA AGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCA GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGGGTCATGGTTCT TACCCGCACACTTTTGGCCAGGGGACCAAGC TGGAGATCAAA 95 1170, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFGGY chain VH YMSWVRQAPGKGLEWVSYIPGSGGSTYYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARYDYYWMDYWGQGTLVTVSS 96 1170, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTGGTGG TTACTACATGTCTTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCATACATTC CTGGTTCTGGTGGTTCTACATACTATGCAGAC TCCGTGAAGGGCCGGTTCACCATCTCCCGTG ACAATTCCAAGAACACGCTGTATCTGCAAATG AACAGCCTGCGTGCCGAGGACACGGCTGTAT ATTATTGTGCGCGCTACGACTACTACTGGATG GACTATTGGGGCCAGGGAACCCTGGTCACC GTCTCCTCA 97 1135, light chain aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN VL WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG SGTDFTLTISSLQPEDFATYYCQQSYSTPYTFG QGTKLEIK 98 1135, light chain nt GACATCCAGATGACCCAGTCTCCATCCTCCC VL TGAGCGCATCTGTAGGAGACCGCGTCACCAT CACTTGCCGGGCAAGTCAGAGCATTAGCAGC TATTTAAATTGGTATCAGCAGAAACCAGGGAA AGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCA GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGAGTTACAGTACC CCTTATACTTTTGGCCAGGGGACCAAGCTGG AGATCAAA 99 1164, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFYGS chain VH SMYWVRQAPGKGLEWVSGIYSSGGYTSYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARGVPHGYFDYWGQGTLVTVSS 100 1164, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTTACGG TTCTTCTATGTACTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCAGGTATTT ACTCTTCTGGTGGTTACACATCTTATGCAGAC TCCGTGAAGGGCCGGTTCACCATCTCCCGTG ACAATTCCAAGAACACGCTGTATCTGCAAATG AACAGCCTGCGTGCCGAGGACACGGCTGTAT ATTATTGTGCGCGCGGTGTTCCTCATGGTTAC TTTGACTATTGGGGCCAGGGAACCCTGGTCA CCGTCTCCTCA 101 1168, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFSGS chain VH SMSWVRQAPGKGLEWVSSISYYGGYTYYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARYFPHYYFDYWGQGTLVTVSS 102 1168, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTAGTGG TTCTTCTATGTCTTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCATCTATTT CTTACTACGGTGGTTACACATACTATGCAGAC TCCGTGAAGGGCCGGTTCACCATCTCCCGTG ACAATTCCAAGAACACGCTGTATCTGCAAATG AACAGCCTGCGTGCCGAGGACACGGCTGTAT ATTATTGTGCGCGCTACTTCCCGCATTACTAC TTTGACTATTGGGGCCAGGGAACCCTGGTCA CCGTCTCCTCA 103 1483, light chain aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN VL WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG SGTDFTLTISSLQPEDFATYYCQQYGSLLTFGQ GTKLEIK 104 1483, light chain nt GACATCCAGATGACCCAGTCTCCATCCTCCC VL TGAGCGCATCTGTAGGAGACCGCGTCACCAT CACTTGCCGGGCAAGTCAGAGCATTAGCAGC TATTTAAATTGGTATCAGCAGAAACCAGGGAA AGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCA GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGTACGGTTCTCTG CTCACTTTTGGCCAGGGGACCAAGCTGGAGA TCAAA 105 1482, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFSSY chain VH AMSWVRQAPGKGLEWVSYISYYSGYTYYADSV KGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCA RGYGYLDYWGQGTLVTVSS 106 1482, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTAGCAG CTATGCCATGAGCTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCATACATTT CTTACTACTCTGGTTACACATACTATGCAGAC TCCGTGAAGGGCCGGTTCACCATCTCCCGTG ACAATTCCAAGAACACGCTGTATCTGCAAATG AACAGCCTGCGTGCCGAGGACACGGCTGTAT ATTATTGTGCGCGCGGTTACGGTTACTTGGA CTATTGGGGCCAGGGAACCCTGGTCACCGTC TCCTCA 107 1490, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFSSY chain VH AMSWVRQAPGKGLEWVSGISYYGGYTYYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARYYPHHYIDYWGQGTLVTVSS 108 1490, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTAGCAG CTATGCCATGAGCTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCAGGTATTT CTTACTACGGTGGTTACACATACTATGCAGAC TCCGTGAAGGGCCGGTTCACCATCTCCCGTG ACAATTCCAAGAACACGCTGTATCTGCAAATG AACAGCCTGCGTGCCGAGGACACGGCTGTAT ATTATTGTGCGCGCTACTACCCGCATCATTAC ATTGACTATTGGGGCCAGGGAACCCTGGTCA CCGTCTCCTCA 109 1515, light chain aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN VL WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG SGTDFTLTISSLQPEDFATYYCQQGDYTLFTFG QGTKLEIK 110 1515, light chain nt GACATCCAGATGACCCAGTCTCCATCCTCCC VL TGAGCGCATCTGTAGGAGACCGCGTCACCAT CACTTGCCGGGCAAGTCAGAGCATTAGCAGC TATTTAAATTGGTATCAGCAGAAACCAGGGAA AGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCA GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGGGTGATTACACT CTGTTCACTTTTGGCCAGGGGACCAAGCTGG AGATCAAA 111 1514, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFGYY chain VH YMSWVRQAPGKGLEWVSGISSYGSYTYYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARSGYSNWANSFDYWGQGTLVTVSS 112 1514, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTGGTTA CTACTACATGTCTTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCAGGTATTT CTTCTTACGGTAGTTACACATACTATGCAGAC TCCGTGAAGGGCCGGTTCACCATCTCCCGTG ACAATTCCAAGAACACGCTGTATCTGCAAATG AACAGCCTGCGTGCCGAGGACACGGCTGTAT ATTATTGTGCGCGCTCTGGTTACTCTAACTGG GCTAACTCTTTTGACTATTGGGGCCAGGGAA CCCTGGTCACCGTCTCCTCA 113 1520, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFSSY chain VH AMSWVRQAPGKGLEWVSAISGSGGSTYYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARYYYSHGYYVYGTLDYWGQGTLVTVSS 114 1520, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTAGCAG CTATGCCATGAGCTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCAGCTATTA GTGGTAGTGGTGGTAGCACATACTATGCAGA CTCCGTGAAGGGCCGGTTCACCATCTCCCGT GACAATTCCAAGAACACGCTGTATCTGCAAAT GAACAGCCTGCGTGCCGAGGACACGGCTGT ATATTATTGTGCGCGCTACTACTACTCTCATG GTTACTACGTTTACGGTACTTTGGACTATTGG GGCCAGGGAACCCTGGTCACCGTCTCCTCA 115 1525, light chain aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN VL WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG SGTDFTLTISSLQPEDFATYYCQQYGPSGLFTF GQGTKLEIK 116 1525, light chain nt GACATCCAGATGACCCAGTCTCCATCCTCCC VL TGAGCGCATCTGTAGGAGACCGCGTCACCAT CACTTGCCGGGCAAGTCAGAGCATTAGCAGC TATTTAAATTGGTATCAGCAGAAACCAGGGAA AGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCA GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGTACGGTCCGTCT GGTCTGTTCACTTTTGGCCAGGGGACCAAGC TGGAGATCAAA 117 1524, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFGSY chain VH YMGWVRQAPGKGLEWVSSIGSYYGYTYYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARHDYGALDYWGQGTLVTVSS 118 1524, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTGGTTC TTACTACATGGGTTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCATCTATTG GTTCTTACTACGGTTACACATACTATGCAGAC TCCGTGAAGGGCCGGTTCACCATCTCCCGTG ACAATTCCAAGAACACGCTGTATCTGCAAATG AACAGCCTGCGTGCCGAGGACACGGCTGTAT ATTATTGTGCGCGCCATGACTACGGTGCTTT GGACTATTGGGGCCAGGGAACCCTGGTCAC CGTCTCCTCA 119 1527, light chain aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN VL WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG SGTDFTLTISSLQPEDFATYYCQQYGSDSLLTF GQGTKLEIK 120 1527, light chain nt GACATCCAGATGACCCAGTCTCCATCCTCCC VL TGAGCGCATCTGTAGGAGACCGCGTCACCAT CACTTGCCGGGCAAGTCAGAGCATTAGCAGC TATTTAAATTGGTATCAGCAGAAACCAGGGAA AGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCA GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGTACGGTTCTGAT TCTCTGCTCACTTTTGGCCAGGGGACCAAGC TGGAGATCAAA 121 1526, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFSGY chain VH SMYWVRQAPGKGLEWVSGIGYSGYGTYYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARYYFHDYAAYSLDYWGQGTLVTVSS 122 1526, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTTCTGG TTACTCTATGTACTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCAGGTATT GGTTACTCTGGTTACGGTACATACTATGCAGA CTCCGTGAAGGGCCGGTTCACCATCTCCCGT GACAATTCCAAGAACACGCTGTATCTGCAAAT GAACAGCCTGCGTGCCGAGGACACGGCTGT ATATTATTGTGCGCGCTACTACTTCCATGACT ACGCTGCTTACTCTTTGGACTATTGGGGCCA GGGAACCCTGGTCACCGTCTCCTCA 123 1542, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFGSS chain VH SMYWVRQAPGKGLEWVSGIGYYSYSTSYADS VKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARGYPHHYFDYWGQGTLVTVSS 124 1542, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGC chain VH TTGGTACAGCCTGGGGGGTCCCTGCGCCTCT CCTGTGCAGCCAGCGGATTCACCTTTGGTTC TTCTTCTATGTACTGGGTCCGCCAGGCTCCA GGGAAGGGGCTGGAGTGGGTCTCAGGTATT GGTTACTACTCTTACTCTACATCTTATGCAGA CTCCGTGAAGGGCCGGTTCACCATCTCCCGT GACAATTCCAAGAACACGCTGTATCTGCAAAT GAACAGCCTGCGTGCCGAGGACACGGCTGT ATATTATTGTGCGCGCGGTTACCCGCATCATT ACTTTGACTATTGGGGCCAGGGAACCCTGGT CACCGTCTCCTCA

TABLE C Exemplary variants of domain of human C086 SEQ ID NO. DESIGNATION SEQUENCE 6 900 LKIQAYFNETADLPCQFANSQNQSLSELVVFWQDQENLVLNEVYL GKEKFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCVIHHK KPSGLVKIHEMNSELSVLA 7 901 LKIQAYFNETADLPCQFANSQNLTLSELVVFWQDQENLVLNEVYLG KEKFDSVHSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCVIHHKKP TGMIKIHEMNSELSVLT 8 904 LKIQAYFNETADLPCQFANSQNQSLSELIVFWQDQENLVLNEVYLG KERFDAVDSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHKKP SGMVKIHQMDSELSVLA 9 906 LKIQAYINETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVYLG KERFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGFYQCIIHHKKP TGLVKIHEMNSELSVLA 10 907 LKIQAYFNETADLPCQFANSQNQSLSELVVFWQDQENLVLNEVYL GKEKFDSVHSKYMGRTSFDSDSWTLRLHNLQIKDKGLYQCIIHHKK PTGMIKIHEMNSELSVLA 11 908 LKIQAYFNETADLPCQFANSQNQSLSELVVFWQDQENLVLNEVYL GKEKFDSVHSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHKK PTGMVKIHEMNSELSVLA 12 910 LKIQAYFNETADLPCQFANSQNQSLSELVVFWQDQENLVLNEVYL GKEKFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHKK PTGMVKIHEMNSELSVLA 13 915 LKIQAYFNETADLPCQFANSQNQSLSELVVFWQDQENLILNEVYLG KEKFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGFYQCIIHHKKP SGLIKIHQMDSELSVLA 14 938 LKIQAYFNETADLPCQFANSQNQSLSELVVFWQDQENLILNEVYLG KEKFDSVHSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHKKP TGMVKIHQMNSELSVLA 15 1038 APLKIQAYFNETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVY LGKEKFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHK KPTGMVKIHEMNSELSVLA 16 1039 APLKIQAYFNETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVY LGKEKFDSVSSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHK KPSGMVKIHQMDSELSVLA 17 1040 APLKIQAYFNETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVY LGKERFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGRYQCIIHH KKPTGMINIHQMNSELSVLA 18 1041 APLKIQAYLNETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVY LGKEKFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHK KPTGLVKIHEMNSELSVLA 19 1042 APLKIQAYFNETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVY LGKEIFDSVSSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHKK PSGMVKIHQMDSELSVLA 20 1043 APLKIQAYFNETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVY LGKEKFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHK KPTGMIKIHEMNSELSVLA 21 1044 APLKIQAYFNETADLPCQFANSQNLTLSELVVFWQDQENLVLNEVY LGKEKFDSVSSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHK KPTGMIKIHEMSSELSVLA 22 1045 APLKIQAYFNETADLPCQFANSQNLTLSELVVFWQDQENLVLNEVY LGKEKFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGLYQCIIHHK KPTGLVKIHEMNSELSVLA 23 1046 APLKIQAYFNETADLPCQFANSQNQSLSELVVFWQDQENLVLNEV YLGKEKFDSVDSKYMGRTSFDSDSWTLRLHNLQIEDKGIYQCIIHH KKPSGMVKIHQMDSELSVLA 24 1047 APLKIQAYFNETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVY LGKEKFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGIYQCIIHHK KPTGLVKIHEMNSELSVLA

TABLE D Exemplary polypeptides for OX40 and CTLA-4 SEQ ID NO. DESIGNATION TYPE SEQUENCE 125 1261 = aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN 1167 light chain WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG VL, with SGTDFTLTISSLQPEDFATYYCQQYYWYGLSTF constant kappa GQGTKLEIKRTVAAPSVFIFPPSDEQLKSGTASV sequence, linker VCLLNNFYPREAKVQWKVDNALQSGNSQESVT (underlined) and EQDSKDSTYSLSSTLTLSKADYEKHKVYACEVT CD86 mutant HQGLSSPVTKSFNRGECSGGGGSGGGGSAPL 1040 KIQAYFNETADLPCQFANSQNLSLSELVVFWQD QENLVLNEVYLGKERFDSVDSKYMGRTSFDSD SWTLRLHNLQIKDKGRYQCIIHHKKPTGMINIHQ MNSELSVLA LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING THE 1166 VH SEQUENCE THUS, COMPLETE MOLECULE MAY BE DESIGNATED 1166/1261 126 1261 = 1267 nt GACATCCAGATGACCCAGTCTCCATCCTCCC light chain VL, TGAGCGCATCTGTAGGAGACCGCGTCACCAT with constant CACTTGCCGGGCAAGTCAGAGCATTAGCAGC kappa TATTTAAATTGGTATCAGCAGAAACCAGGGAA sequence, linker AGCCCCTAAGCTCCTGATCTATGCTGCATCC and CD86 AGTTTGCAAAGTGGGGTCCCATCACGTTTCA mutant 1040 GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGTACTACTGGTAC GGTCTGTCCACTTTTGGCCAGGGGACCAAGC TGGAGATCAAACgtgagtcgtacgctagcaagcttgatatc gaattctaaactctgagggggtcggatgacgtggccattctttgcct aaagcattgagtttactgcaaggtcagaaaagcatgcaaagccct cagaatggctgcaaagagctccaacaaaacaatttagaactttatt aaggaatagggggaagctaggaagaaactcaaaacatcaaga ttttaaatacgcttcttggtctccttgctataattatctgggataagcatg ctgttttctgtctgtccctaacatgccctgtgattatccgcaaacaaca cacccaagggcagaactttgttacttaaacaccatcctgtttgcttctt tcctcagGAACTGTGGCTGCACCATCTGTOTTCA TCTTCCCGCCATCTGATGAGCAGTTGAAATCT GGAACTGCCTCTGTTGTGTGCCTGCTGAATA ACTTCTATCCCAGAGAGGCCAAAGTACAGTG GAAGGTGGATAACGCCCTCCAATCGGGTAAC TCCCAGGAGAGTGTCACAGAGCAGGACAGCA AGGACAGCACCTACAGCCTCAGCAGCACCCT GACGCTGAGCAAAGCAGACTACGAGAAACAC AAAGTCTACGCCTGCGAAGTCACCCATCAGG GCCTGAGCTCGCCCGTCACAAAGAGCTTCAA CAGGGGAGAGTGTAGCGGAGGAGGAGGAAG CGGAGGAGGAGGAAGCGCCCCCCTCAAAAT CCAAGCGTACTTCAACGAAACTGCAGACTTA CCGTGTCAGTTTGCCAATTCGCAGAATCTGA GCCTGAGCGAACTGGTGGTTTTCTGGCAGGA TCAGGAGAACCTGGTTCTGAACGAAGTCTAT CTGGGCAAAGAGCGGTTCGACAGCGTGGAC AGCAAGTATATGGGCCGCACCAGCTTTGATA GCGACAGCTGGACCCTGCGTCTGCACAATCT GCAAATCAAAGATAAGGGTAGGTACCAGTGC ATTATCCACCATAAGAAGCCGACGGGTATGA TTAATATTCACCAAATGAACTCCGAGTTGTCT GTCCTGGCG 127 1263 = 1171 aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN light chain VL, WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG with constant SGTDFTLTISSLQPEDFATYYCQQGHGSYPHTF kappa GQGTKLEIKRTVAAPSVFIFPPSDEQLKSGTASV sequence, linker VCLLNNFYPREAKVQWKVDNALQSGNSQESVT (underlined) and EQDSKDSTYSLSSTLTLSKADYEKHKVYACEVT CD86 mutant HQGLSSPVTKSFNRGECSGGGGSGGGGSAPL 1040 KIQAYFNETADLPCQFANSQNLSLSELVVFWQD QENLVLNEVYLGKERFDSVDSKYMGRTSFDSD SWTLRLHNLQIKDKGRYQCIIHHKKPTGMINIHQ MNSELSVLA LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING THE 1170 VH SEQUENCE THUS, COMPLETE MOLECULE MAY BE DESIGNATED 1170/1263 128 1263 = 1171 nt GACATCCAGATGACCCAGTCTCCATCCTCCC light chain VL, TGAGCGCATCTGTAGGAGACCGCGTCACCAT with constant CACTTGCCGGGCAAGTCAGAGCATTAGCAGC kappa TATTTAAATTGGTATCAGCAGAAACCAGGGAA sequence, linker AGCCCCTAAGCTCCTGATCTATGCTGCATCC and CD86 AGTTTGCAAAGTGGGGTCCCATCACGTTTCA mutant 1040 GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGGGTCATGGTTCT TACCCGCACACTTTTGGCCAGGGGACCAAGC TGGAGATCAAACgtgagtcgtacgctagcaagcttgatatc gaattctaaactctgagggggtcggatgacgtggccattctttgcct aaagcattgagtttactgcaaggtcagaaaagcatgcaaagccct cagaatggctgcaaagagctccaacaaaacaatttagaactttatt aaggaatagggggaagctaggaagaaactcaaaacatcaaga ttttaaatacgcttcttggtctccttgctataattatctgggataagcatg ctgttttctgtctgtccctaacatgccctgtgattatccgcaaacaaca cacccaagggcagaactttgttacttaaacaccatcctgtttgcttctt tcctcagGAACTGTGGCTGCACCATCTGTOTTCA TCTTCCCGCCATCTGATGAGCAGTTGAAATCT GGAACTGCCTCTGTTGTGTGCCTGCTGAATA ACTTCTATCCCAGAGAGGCCAAAGTACAGTG GAAGGTGGATAACGCCCTCCAATCGGGTAAC TCCCAGGAGAGTGTCACAGAGCAGGACAGCA AGGACAGCACCTACAGCCTCAGCAGCACCCT GACGCTGAGCAAAGCAGACTACGAGAAACAC AAAGTCTACGCCTGCGAAGTCACCCATCAGG GCCTGAGCTCGCCCGTCACAAAGAGCTTCAA CAGGGGAGAGTGTAGCGGAGGAGGAGGAAG CGGAGGAGGAGGAAGCGCCCCCCTCAAAAT CCAAGCGTACTTCAACGAAACTGCAGACTTA CCGTGTCAGTTTGCCAATTCGCAGAATCTGA GCCTGAGCGAACTGGTGGTTTTCTGGCAGGA TCAGGAGAACCTGGTTCTGAACGAAGTCTAT CTGGGCAAAGAGCGGTTCGACAGCGTGGAC AGCAAGTATATGGGCCGCACCAGCTTTGATA GCGACAGCTGGACCCTGCGTCTGCACAATCT GCAAATCAAAGATAAGGGTAGGTACCAGTGC ATTATCCACCATAAGAAGCCGACGGGTATGA TTAATATTCACCAAATGAACTCCGAGTTGTCT GTCCTGGCG 129 1141 = 1135 aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN light chain VL, WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG with constant SGTDFTLTISSLQPEDFATYYCQQSYSTPYTFG kappa QGTKLEIKRTVAAPSVFIFPPSDEQLKSGTASVV sequence, linker CLLNNFYPREAKVQWKVDNALQSGNSQESVTE (underlined) and QDSKDSTYSLSSTLTLSKADYEKHKVYACEVTH CD86 mutant QGLSSPVTKSFNRGECSGGGGSGGGGSAPLKI 1040 QAYFNETADLPCQFANSQNLSLSELVVFWQDQ ENLVLNEVYLGKERFDSVDSKYMGRTSFDSDS WTLRLHNLQIKDKGRYQCIIHHKKPTGMINIHQM NSELSVLA LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING ANY ONE OF THE 1164, 1168, 1520, OR 1542 VH SEQUENCES THUS, COMPLETE MOLECULES MAY BE DESIGNATED 1164/1141, 1168/1141, 1520/1141 OR 1542/1141 130 1141 = 1135 nt GACATCCAGATGACCCAGTCTCCATCCTCCC light chain VL, TGAGCGCATCTGTAGGAGACCGCGTCACCAT with constant CACTTGCCGGGCAAGTCAGAGCATTAGCAGC kappa TATTTAAATTGGTATCAGCAGAAACCAGGGAA sequence, linker AGCCCCTAAGCTCCTGATCTATGCTGCATCC and CD86 AGTTTGCAAAGTGGGGTCCCATCACGTTTCA mutant 1040 GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGAGTTACAGTACC CCTTATACTTTTGGCCAGGGGACCAAGCTGG AGATCAAACgtgagtcgtacgctagcaagcttgatatcgaatt ctaaactctgagggggtcggatgacgtggccattctttgcctaaag cattgagtttactgcaaggtcagaaaagcatgcaaagccctcaga atggctgcaaagagctccaacaaaacaatttagaactttattaagg aatagggggaagctaggaagaaactcaaaacatcaagattttaa atacgcttcttggtctccttgctataattatctgggataagcatgctgttt tctgtctgtccctaacatgccctgtgattatccgcaaacaacacacc caagggcagaactttgttacttaaacaccatcctgtttgcttctttcctc agGAACTGTGGCTGCACCATCTGTCTTCATCT TCCCGCCATCTGATGAGCAGTTGAAATCTGG AACTGCCTCTGTTGTGTGCCTGCTGAATAACT TCTATCCCAGAGAGGCCAAAGTACAGTGGAA GGTGGATAACGCCCTCCAATCGGGTAACTCC CAGGAGAGTGTCACAGAGCAGGACAGCAAG GACAGCACCTACAGCCTCAGCAGCACCCTGA CGCTGAGCAAAGCAGACTACGAGAAACACAA AGTCTACGCCTGCGAAGTCACCCATCAGGGC CTGAGCTCGCCCGTCACAAAGAGCTTCAACA GGGGAGAGTGTAGCGGAGGAGGAGGAAGCG GAGGAGGAGGAAGCGCCCCCCTCAAAATCC AAGCGTACTTCAACGAAACTGCAGACTTACC GTGTCAGTTTGCCAATTCGCAGAATCTGAGC CTGAGCGAACTGGTGGTTTTCTGGCAGGATC AGGAGAACCTGGTTCTGAACGAAGTCTATCT GGGCAAAGAGCGGTTCGACAGCGTGGACAG CAAGTATATGGGCCGCACCAGCTTTGATAGC GACAGCTGGACCCTGCGTCTGCACAATCTGC AAATCAAAGATAAGGGTAGGTACCAGTGCATT ATCCACCATAAGAAGCCGACGGGTATGATTA ATATTCACCAAATGAACTCCGAGTTGTCTGTC CTGGCG 131 1581 = 1515 aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN light chain VL, WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG with constant SGTDFTLTISSLQPEDFATYYCQQGDYTLFTFG kappa QGTKLEIKRTVAAPSVFIFPPSDEQLKSGTASVV sequence, linker CLLNNFYPREAKVQWKVDNALQSGNSQESVTE (underlined) and QDSKDSTYSLSSTLTLSKADYEKHKVYACEVTH CD86 mutant QGLSSPVTKSFNRGECSGGGGSGGGGSAPLKI 1040 QAYFNETADLPCQFANSQNLSLSELVVFWQDQ ENLVLNEVYLGKERFDSVDSKYMGRTSFDSDS WTLRLHNLQIKDKGRYQCIIHHKKPTGMINIHQM NSELSVLA LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING THE 1514 VH SEQUENCE THUS, COMPLETE MOLECULE MAY BE DESIGNATED 1514/1581 132 1581 = 1515 nt GACATCCAGATGACCCAGTCTCCATCCTCCC light chain VL, TGAGCGCATCTGTAGGAGACCGCGTCACCAT with constant CACTTGCCGGGCAAGTCAGAGCATTAGCAGC kappa TATTTAAATTGGTATCAGCAGAAACCAGGGAA sequence, linker AGCCCCTAAGCTCCTGATCTATGCTGCATCC and CD86 AGTTTGCAAAGTGGGGTCCCATCACGTTTCA mutant 1040 GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGGGTGATTACACT CTGTTCACTTTTGGCCAGGGGACCAAGCTGG AGATCAAACgtgagtcgtacgctagcaagcttgatatcgaatt ctaaactctgagggggtcggatgacgtggccattctttgcctaaag cattgagtttactgcaaggtcagaaaagcatgcaaagccctcaga atggctgcaaagagctccaacaaaacaatttagaactttattaagg aatagggggaagctaggaagaaactcaaaacatcaagattttaa atacgcttcttggtctccttgctataattatctgggataagcatgctgttt tctgtctgtccctaacatgccctgtgattatccgcaaacaacacacc caagggcagaactttgttacttaaacaccatcctgtttgcttctttcctc agGAACTGTGGCTGCACCATCTGTCTTCATCT TCCCGCCATCTGATGAGCAGTTGAAATCTGG AACTGCCTCTGTTGTGTGCCTGCTGAATAACT TCTATCCCAGAGAGGCCAAAGTACAGTGGAA GGTGGATAACGCCCTCCAATCGGGTAACTCC CAGGAGAGTGTCACAGAGCAGGACAGCAAG GACAGCACCTACAGCCTCAGCAGCACCCTGA CGCTGAGCAAAGCAGACTACGAGAAACACAA AGTCTACGCCTGCGAAGTCACCCATCAGGGC CTGAGCTCGCCCGTCACAAAGAGCTTCAACA GGGGAGAGTGTAGCGGAGGAGGAGGAAGCG GAGGAGGAGGAAGCGCCCCCCTCAAAATCC AAGCGTACTTCAACGAAACTGCAGACTTACC GTGTCAGTTTGCCAATTCGCAGAATCTGAGC CTGAGCGAACTGGTGGTTTTCTGGCAGGATC AGGAGAACCTGGTTCTGAACGAAGTCTATCT GGGCAAAGAGCGGTTCGACAGCGTGGACAG CAAGTATATGGGCCGCACCAGCTTTGATAGC GACAGCTGGACCCTGCGTCTGCACAATCTGC AAATCAAAGATAAGGGTAGGTACCAGTGCATT ATCCACCATAAGAAGCCGACGGGTATGATTA ATATTCACCAAATGAACTCCGAGTTGTCTGTC CTGGCG 133 1585 = 1527 aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLN light chain VL, WYQQKPGKAPKLLIYAASSLQSGVPSRFSGSG with constant SGTDFTLTISSLQPEDFATYYCQQYGSDSLLTF kappa GQGTKLEIKRTVAAPSVFIFPPSDEQLKSGTASV sequence, linker VCLLNNFYPREAKVQWKVDNALQSGNSQESVT (underlined) and EQDSKDSTYSLSSTLTLSKADYEKHKVYACEVT CD86 mutant HQGLSSPVTKSFNRGECSGGGGSGGGGSAPL 1040 KIQAYFNETADLPCQFANSQNLSLSELVVFWQD QENLVLNEVYLGKERFDSVDSKYMGRTSFDSD SWTLRLHNLQIKDKGRYQCIIHHKKPTGMINIHQ MNSELSVLA LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING THE 1526 VH SEQUENCE THUS, COMPLETE MOLECULE MAY BE DESIGNATED 1526/1585 134 1585 = 1527 nt GACATCCAGATGACCCAGTCTCCATCCTCCC light chain VL, TGAGCGCATCTGTAGGAGACCGCGTCACCAT with constant CACTTGCCGGGCAAGTCAGAGCATTAGCAGC kappa TATTTAAATTGGTATCAGCAGAAACCAGGGAA sequence, linker AGCCCCTAAGCTCCTGATCTATGCTGCATCC and CD86 AGTTTGCAAAGTGGGGTCCCATCACGTTTCA mutant 1040 GTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGTACGGTTCTGAT TCTCTGCTCACTTTTGGCCAGGGGACCAAGC TGGAGATCAAACgtgagtcgtacgctagcaagcttgatatc gaattctaaactctgagggggtcggatgacgtggccattctttgcct aaagcattgagtttactgcaaggtcagaaaagcatgcaaagccct cagaatggctgcaaagagctccaacaaaacaatttagaactttatt aaggaatagggggaagctaggaagaaactcaaaacatcaaga ttttaaatacgcttcttggtctccttgctataattatctgggataagcatg ctgttttctgtctgtccctaacatgccctgtgattatccgcaaacaaca cacccaagggcagaactttgttacttaaacaccatcctgtttgcttctt tcctcagGAACTGTGGCTGCACCATCTGTOTTCA TCTTCCCGCCATCTGATGAGCAGTTGAAATCT GGAACTGCCTCTGTTGTGTGCCTGCTGAATA ACTTCTATCCCAGAGAGGCCAAAGTACAGTG GAAGGTGGATAACGCCCTCCAATCGGGTAAC TCCCAGGAGAGTGTCACAGAGCAGGACAGCA AGGACAGCACCTACAGCCTCAGCAGCACCCT GACGCTGAGCAAAGCAGACTACGAGAAACAC AAAGTCTACGCCTGCGAAGTCACCCATCAGG GCCTGAGCTCGCCCGTCACAAAGAGCTTCAA CAGGGGAGAGTGTAGCGGAGGAGGAGGAAG CGGAGGAGGAGGAAGCGCCCCCCTCAAAAT CCAAGCGTACTTCAACGAAACTGCAGACTTA CCGTGTCAGTTTGCCAATTCGCAGAATCTGA GCCTGAGCGAACTGGTGGTTTTCTGGCAGGA TCAGGAGAACCTGGTTCTGAACGAAGTCTAT CTGGGCAAAGAGCGGTTCGACAGCGTGGAC AGCAAGTATATGGGCCGCACCAGCTTTGATA GCGACAGCTGGACCCTGCGTCTGCACAATCT GCAAATCAAAGATAAGGGTAGGTACCAGTGC ATTATCCACCATAAGAAGCCGACGGGTATGA TTAATATTCACCAAATGAACTCCGAGTTGTCT GTCCTGGCG

TABLE E Exemplary polynucleotides encoding B2 - CTLA-4 SEQ ID 25 900 CTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGTG TCAGTTTGCCAATTCGCAGAATCAAAGCCTGAGCGAACTGGTG GTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACGAAGTCTA TCTGGGCAAAGAGAAATTCGACAGCGTGGACAGCAAGTATATG GGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTGCGTCTGC ACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTGCGTGATC CACCATAAGAAGCCGAGCGGTCTGGTGAAGATTCACGAGATGA ACTCCGAGTTGTCTGTCCTGGCG 26 901 CTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGTG TCAGTTTGCCAATTCGCAGAATCTGACCCTGAGCGAACTGGTG GTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACGAAGTCTA TCTGGGCAAAGAGAAATTCGACAGCGTGCATAGCAAGTATATG GGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTGCGTCTGC ACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTGCGTGATC CACCATAAGAAGCCGACGGGTATGATTAAGATTCACGAGATGAA CTCCGAGTTGTCTGTCCTGACC 27 904 CTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGTG TCAGTTTGCCAATTCGCAGAATCAAAGCCTGAGCGAACTGATCG TTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACGAAGTCTAT CTGGGCAAAGAGCGGTTCGACGCCGTGGACAGCAAGTATATGG GCCGCACCAGCTTTGATAGCGACAGCTGGACCCTGCGTCTGCA CAATCTGCAAATCAAAGATAAGGGTATCTACCAGTGCATTATCC ACCATAAGAAGCCGAGCGGTATGGTGAAGATTCACCAAATGGA CTCCGAGTTGTCTGTCCTGGCG 28 906 CTCAAAATCCAAGCGTACATCAACGAAACTGCAGACTTACCGTG TCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAACTGGTG GTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACGAAGTCTA TCTGGGCAAAGAGCGGTTCGACAGCGTGGACAGCAAGTATATG GGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTGCGTCTGC ACAATCTGCAAATCAAAGATAAGGGTTTCTACCAGTGCATTATC CACCATAAGAAGCCGACGGGTCTGGTGAAGATTCACGAGATGA ACTCCGAGTTGTCTGTCCTGGCG 29 907 CTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGTG TCAGTTTGCCAATTCGCAGAATCAAAGCCTGAGCGAACTGGTG GTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACGAAGTCTA TCTGGGCAAAGAGAAATTCGACAGCGTGCATAGCAAGTATATG GGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTGCGTCTGC ACAATCTGCAAATCAAAGATAAGGGTCTGTACCAGTGCATTATC CACCATAAGAAGCCGACGGGTATGATTAAGATTCACGAGATGAA CTCCGAGTTGTCTGTCCTGGCG 30 908 CTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGTG TCAGTTTGCCAATTCGCAGAATCAAAGCCTGAGCGAACTGGTG GTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACGAAGTCTA TCTGGGCAAAGAGAAATTCGACAGCGTGCATAGCAAGTATATG GGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTGCGTCTGC ACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTGCATTATC CACCATAAGAAGCCGACGGGTATGGTGAAGATTCACGAGATGA ACTCCGAGTTGTCTGTCCTGGCG 31 910 CTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGTG TCAGTTTGCCAATTCGCAGAATCAAAGCCTGAGCGAACTGGTG GTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACGAAGTCTA TCTGGGCAAAGAGAAATTCGACAGCGTGGACAGCAAGTATATG GGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTGCGTCTGC ACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTGCATTATC CACCATAAGAAGCCGACGGGTATGGTGAAGATTCACGAGATGA ACTCCGAGTTGTCTGTCCTGGCG 32 915 CTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGTG TCAGTTTGCCAATTCGCAGAATCAAAGCCTGAGCGAACTGGTG GTTTTCTGGCAGGATCAGGAGAACCTGATCCTGAACGAAGTCTA TCTGGGCAAAGAGAAATTCGACAGCGTGGACAGCAAGTATATG GGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTGCGTCTGC ACAATCTGCAAATCAAAGATAAGGGTTTCTACCAGTGCATTATC CACCATAAGAAGCCGAGCGGTCTGATTAAGATTCACCAAATGGA CTCCGAGTTGTCTGTCCTGGCG 33 938 CTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGTG TCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAACTGGTG GTTTTCTGGCAGGATCAGGAGAACCTGATCCTGAACGAAGTCTA TCTGGGCAAAGAGCGGTTCGACAGCGTGCATAGCAAGTATATG GGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTGCGTCTGC ACAATCTGCAAATCAAAGATAAGGGTCTGTACCAGTGCATTATC CACCATAAGAAGCCGAGCGGTATGGTGAAGATTCACGAGATGA ACTCCGAGTTGTCTGTCCTGGCG 34 1038 GCCCCCCTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGAAATTCGACAGCGTGGACAGCAA GTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTG CATTATCCACCATAAGAAGCCGACGGGTATGGTGAAGATTCAC GAGATGAACTCCGAGTTGTCTGTCCTGGCG 35 1039 GCCCCCCTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGAAATTCGACAGCGTGAGTAGCAA GTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTG CATTATCCACCATAAGAAGCCGAGCGGTATGGTGAAGATTCACC AAATGGACTCCGAGTTGTCTGTCCTGGCG 36 1040 GCCCCCCTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGCGGTTCGACAGCGTGGACAGCAA GTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCAAAGATAAGGGTAGGTACCAGTG CATTATCCACCATAAGAAGCCGACGGGTATGATTAATATTCACC AAATGAACTCCGAGTTGTCTGTCCTGGCG 37 1041 GCCCCCCTCAAAATCCAAGCGTACCTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGAAATTCGACAGCGTGGACAGCAA GTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTG CATTATCCACCATAAGAAGCCGACGGGTCTGGTGAAGATTCAC GAGATGAACTCCGAGTTGTCTGTCCTGGCG 38 1042 GCCCCCCTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGATTTTCGACAGCGTGAGTAGCAA GTATATGGGCCGCACCAGCTTTGATAGTGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTG CATTATCCACCATAAGAAGCCGAGCGGTATGGTGAAGATTCACC AAATGGACTCCGAGTTGTCTGTCCTGGCG 39 1043 GCCCCCCTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGAAATTCGACAGCGTGGATAGCAA GTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTG CATTATCCACCATAAGAAGCCGACGGGTATGATTAAGATTCACG AGATGAACTCCGAGTTGTCTGTCCTGGCG 40 1044 GCCCCCCTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCTGACCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGAAATTCGACAGCGTGTCTAGCAA GTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTG CATTATCCACCATAAGAAGCCGACGGGTATGATTAAGATTCACG AGATGAGCTCCGAGTTGTCTGTCCTGGCG 41 1045 GCCCCCCTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCTGACCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGAAATTCGACAGCGTGGACAGCAA GTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCAAAGATAAGGGTCTGTACCAGTG CATTATCCACCATAAGAAGCCGACGGGTCTGGTGAAGATTCAC GAGATGAACTCCGAGTTGTCTGTCCTGGCG 42 1046 GCCCCCCTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCAAAGCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGAAATTCGACAGCGTGGACAGCAA GTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCGAAGATAAGGGTATCTACCAGTG CATTATCCACCATAAGAAGCCGAGCGGTATGGTGAAGATTCACC AAATGGACTCCGAGTTGTCTGTCCTGGCG 43 1047 GCCCCCCTCAAAATCCAAGCGTACTTCAACGAAACTGCAGACTT ACCGTGTCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAA CTGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGAAATTCGACAGCGTGGACAGCAA GTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGACCCTG CGTCTGCACAATCTGCAAATCAAAGATAAGGGTATCTACCAGTG CATTATCCACCATAAGAAGCCGACGGGTCTGGTGAAGATTCAC GAGATGAACTCCGAGTTGTCTGTCCTGGCG

TABLE F Exemplary sequences SEQ ID NO DESIGNATION SEQUENCE 149 Fusion of: EVQLLESGGGLVQPGGSLRLSCAASGFTFYGSSMYW VH1: 1164 (bold VRQAPGKGLEWVSGIYSSGGYTSYADSVKGRFTISRD underlined) NSKNTLYLQMNSLRAEDTAVYYCARGVPHGYFDYWG IgG1 constant QGTLVTVSS ASTKGPSVFPLAPSSKSTSGGTAALGCLV domains (italics) KDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLS Linker SVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCD (underlined) KTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEV VH2: 1204 (bold) TCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQ VL2: 1205 (bold, YNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIE italics) KTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKG FYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSK LTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSP GK GGGGSGGGGSGGGGS EVQLLESGGGLVQPGGSL RLSCAASGFTFSSYYMGWVRQAPGKGLEWVSGIGSY YGYTGYADSVKGRFTISRDNSKNTLYLQMNSLRAEDT AVYYCARAYYDYNYYYAYFDYWGQGTLVTVSS GGGG SGGGGSGGGGS

This sequence typically expressed together with a light chain sequence comprising VL1 1135 (SEQ ID NO: 97) fused to kappa sequence (SEQ ID NO: 136) to assemble a 1164/1135-1204/1205 bispecific antibody. 150 Nucleotide GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGT sequence ACAGCCTGGGGGGTCCCTGCGCCTCTCCTGTGCAG encoding SEQ ID CCAGCGGATTCACCTTTTACGGTTCTTCTATGTACTG NO: 149 GGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTGG GTCTCAGGTATTTACTCTTCTGGTGGTTACACATCTT ATGCAGACTCCGTGAAGGGCCGGTTCACCATCTCCC GTGACAATTCCAAGAACACGCTGTATCTGCAAATGA ACAGCCTGCGTGCCGAGGACACGGCTGTATATTATT GTGCGCGCGGTGTTCCTCATGGTTACTTTGACTATT GGGGCCAGGGAACCCTGGTCACCGTCTCCTCAGGT GAGTTaaCgtacgctagcaagctttctggggcaggccaggcctgacctt ggctttggggcagggagggggctaaggtgaggcaggtggcgccagccag gtgcacacccaatgcccatgagcccagacactggacgctgaacctcgcgg acagttaagaacccaggggcctctgcgccctgggcccagctctgtcccaca ccgcggtcacatggcaccacctctcttgcagCCTCCACCAAGGGC CCATCGGTCTTCCCCCTGGCACCCTCCTCCAAGAGC ACCTCTGGGGGCACAGCGGCCCTGGGCTGCCTGGT CAAGGACTACTTCCCCGAACCGGTGACGGTGTCGT GGAACTCAGGCGCCCTGACCAGCGGCGTGCACACC TTCCCGGCTGTCCTACAGTCCTCAGGACTCTACTCC CTCAGCAGCGTGGTGACCGTGCCCTCCAGCAGCTT GGGCACCCAGACCTACATCTGCAACGTGAATCACAA GCCCAGCAACACCAAGGTGGACAAGAAAGTTGgtgag aggccagcacagggagggagggtgtctgctggaagccaggctcagcgctc ctgcctggacgcatcccggctatgcagccccagtccagggcagcaaggca ggccccgtctgcctcttcacccggaggcctctgcccgccccactcatgctcag ggagagggtcttctggctttttccccaggctctgggcaggcacaggctaggtg cccctaacccaggccctgcacacaaaggggcaggtgctgggctcagacct gccaagagccatatccgggaggaccctgcccctgacctaagcccacccca aaggccaaactctccactccctcagctcggacaccttctctcctcccagattcc agtaactcccaatcttctctctgcagAGCCCAAATCTTGTGACAA AACTCACACATGCCCACCGTGCCCAGgtaagccagccca ggcctcgccctccagctcaaggcgggacaggtgccctagagtagcctgcat ccagggacaggccccagccgggtgctgacacgtccacctccatctcttcctc agCACCTGAACTCCTGGGGGGACCGTCAGTCTTCCT CTTCCCCCCAAAACCCAAGGACACCCTCATGATCTC CCGGACCCCTGAGGTCACATGCGTGGTGGTGGACG TGAGCCACGAAGACCCTGAGGTCAAGTTCAACTGGT ACGTGGACGGCGTGGAGGTGCATAATGCCAAGACA AAGCCGCGGGAGGAGCAGTACAACAGCACGTACCG TGTGGTCAGCGTCCTCACCGTCCTGCACCAGGACTG GCTGAATGGCAAGGAGTACAAGTGCAAGGTCTCCAA CAAAGCCCTCCCAGCCCCCATCGAGAAAACCATCTC CAAAGCCAAAGgtgggacccgtggggtgcgagggccacatggaca gaggccggctcggcccaccctctgccctgagagtgaccgctgtaccaacct ctgtccctacagGGCAGCCCCGAGAACCACAGGTGTACA CCCTGCCCCCATCCCGGGATGAGCTGACCAAGAAC CAGGTCAGCCTGACCTGCCTGGTCAAAGGCTTCTAT CCCAGCGACATCGCCGTGGAGTGGGAGAGCAATGG GCAGCCGGAGAACAACTACAAGACCACGCCTCCCG TGCTGGACTCCGACGGCTCCTTCTTCCTCTACAGCA AGCTCACCGTGGACAAGAGCAGGTGGCAGCAGGGG AACGTCTTCTCATGCTCCGTGATGCATGAGGCTCTG CACAACCACTACACGCAGAAGAGCCTCTCCCTGTCT CCGGGTAAAGGAGGAGGAGGAAGCGGAGGAGGAG GAAGCGGAGGAGGAGGAAGCGAGGTGCAGCTGCTC GAGAGCGGGGGAGGCTTGGTACAGCCTGGGGGGT CCCTGCGCCTCTCCTGTGCAGCCAGCGGATTCACCT TTTCTTCTTACTACATGGGTTGGGTCCGCCAGGCTC CAGGGAAGGGGCTGGAGTGGGTCTCAGGTATTGGT TCTTACTACGGTTACACAGGTTATGCAGACTCCGTG AAGGGCCGGTTCACCATCTCCCGTGACAATTCCAAG AACACGCTGTATCTGCAAATGAACAGCCTGCGTGCC GAGGACACGGCTGTATATTATTGTGCGCGCGCTTAC TACGACTACAACTACTACTACGCTTACTTTGACTATT GGGGCCAGGGAACCCTGGTCACCGTCTCCTCAGGT GGAGGCGGTTCAGGCGGAGGTGGATCCGGCGGTG GCGGATCGGACATCCAGATGACCCAGTCTCCATCCT CCCTGAGCGCATCTGTAGGAGACCGCGTCACCATCA CTTGCCGGGCAAGTCAGAGCATTAGCAGCTATTTAA ATTGGTATCAGCAGAAACCAGGGAAAGCCCCTAAGC TCCTGATCTATGCTGCATCCAGTTTGCAAAGTGGGG TCCCATCACGTTTCAGTGGCAGTGGAAGCGGGACA GATTTCACTCTCACCATCAGCAGTCTGCAACCTGAA GATTTTGCAACTTATTACTGTCAACAGTCTGTTCCGC ACTACCCGTTCACTTTTGGCCAGGGGACCAAGCTGG AGATCAAACGC 151 Fusion of: EVQLLESGGGLVQPGGSLRLSCAASGFTFGGYYMSW VH1: 1166 (bold VRQAPGKGLEWVSAISGSGGSTYYADSVKGRFTISRD underlined) NSKNTLYLQMNSLRAEDTAVYYCARYDYASMDYWG IgG1 constant QGTLVTVSS ASTKGPSVFPLAPSSKSTSGGTAALGCLV domains (italics) KDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLS Linker SVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCD (underlined) KTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEV VH2: 1204 (bold) TCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQ VL2: 1205 (bold, YNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIE italics) KTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKG FYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSK LTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSP GK GGGGSGGGGSGGGGS EVQLLESGGGLVQPGGSL RLSCAASGFTFSSYYMGWVRQAPGKGLEWVSGIGSY YGYTGYADSVKGRFTISRDNSKNTLYLQMNSLRAEDT AVYYCARAYYDYNYYYAYFDYWGQGTLVTVSS GGGG SGGGGSGGGGS

This sequence typically expressed together with a light chain sequence comprising VL1 1167 (SEQ ID NO: 89) fused to kappa sequence (SEQ ID NO: 136) to assemble a 1166/1167-1204/1205 bispecific antibody. 152 Nucleotide GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGT sequence ACAGCCTGGGGGGTCCCTGCGCCTCTCCTGTGCAG encoding SEQ ID CCAGCGGATTCACCTTTGGTGGTTACTACATGTCTT NO: 151 GGGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTG GGTCTCAGCTATTAGTGGTAGTGGTGGTAGCACATA CTATGCAGACTCCGTGAAGGGCCGGTTCACCATCTC CCGTGACAATTCCAAGAACACGCTGTATCTGCAAAT GAACAGCCTGCGTGCCGAGGACACGGCTGTATATTA TTGTGCGCGCTACGACTACGCTTCTATGGACTATTG GGGCCAGGGAACCCTGGTCACCGTCTCCTCAGGTG AGTTaaCgtacgctagcaagctttctggggcaggccaggcctgaccttgg ctttggggcagggagggggctaaggtgaggcaggtggcgccagccaggtg cacacccaatgcccatgagcccagacactggacgctgaacctcgcggaca gttaagaacccaggggcctctgcgccctgggcccagctctgtcccacaccg cggtcacatggcaccacctctcttgcagCCTCCACCAAGGGCCCA TCGGTCTTCCCCCTGGCACCCTCCTCCAAGAGCACC TCTGGGGGCACAGCGGCCCTGGGCTGCCTGGTCAA GGACTACTTCCCCGAACCGGTGACGGTGTCGTGGA ACTCAGGCGCCCTGACCAGCGGCGTGCACACCTTC CCGGCTGTCCTACAGTCCTCAGGACTCTACTCCCTC AGCAGCGTGGTGACCGTGCCCTCCAGCAGCTTGGG CACCCAGACCTACATCTGCAACGTGAATCACAAGCC CAGCAACACCAAGGTGGACAAGAAAGTTGgtgagaggc cagcacagggagggagggtgtctgctggaagccaggctcagcgctcctgc ctggacgcatcccggctatgcagccccagtccagggcagcaaggcaggcc ccgtctgcctcttcacccggaggcctctgcccgccccactcatgctcagggag agggtcttctggctttttccccaggctctgggcaggcacaggctaggtgcccct aacccaggccctgcacacaaaggggcaggtgctgggctcagacctgcca agagccatatccgggaggaccctgcccctgacctaagcccaccccaaagg ccaaactctccactccctcagctcggacaccttctctcctcccagattccagta actcccaatcttctctctgcagAGCCCAAATCTTGTGACAAAAC TCACACATGCCCACCGTGCCCAGgtaagccagcccaggcct cgccctccagctcaaggcgggacaggtgccctagagtagcctgcatccagg gacaggccccagccgggtgctgacacgtccacctccatctcttcctcagCA CCTGAACTCCTGGGGGGACCGTCAGTCTTCCTCTTC CCCCCAAAACCCAAGGACACCCTCATGATCTCCCGG ACCCCTGAGGTCACATGCGTGGTGGTGGACGTGAG CCACGAAGACCCTGAGGTCAAGTTCAACTGGTACGT GGACGGCGTGGAGGTGCATAATGCCAAGACAAAGC CGCGGGAGGAGCAGTACAACAGCACGTACCGTGTG GTCAGCGTCCTCACCGTCCTGCACCAGGACTGGCT GAATGGCAAGGAGTACAAGTGCAAGGTCTCCAACAA AGCCCTCCCAGCCCCCATCGAGAAAACCATCTCCAA AGCCAAAGgtgggacccgtggggtgcgagggccacatggacagagg ccggctcggcccaccctctgccctgagagtgaccgctgtaccaacctctgtcc ctacagGGCAGCCCCGAGAACCACAGGTGTACACCCT GCCCCCATCCCGGGATGAGCTGACCAAGAACCAGG TCAGCCTGACCTGCCTGGTCAAAGGCTTCTATCCCA GCGACATCGCCGTGGAGTGGGAGAGCAATGGGCAG CCGGAGAACAACTACAAGACCACGCCTCCCGTGCT GGACTCCGACGGCTCCTTCTTCCTCTACAGCAAGCT CACCGTGGACAAGAGCAGGTGGCAGCAGGGGAACG TCTTCTCATGCTCCGTGATGCATGAGGCTCTGCACA ACCACTACACGCAGAAGAGCCTCTCCCTGTCTCCGG GTAAAGGAGGAGGAGGAAGCGGAGGAGGAGGAAG CGGAGGAGGAGGAAGCGAGGTGCAGCTGCTCGAGA GCGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCT GCGCCTCTCCTGTGCAGCCAGCGGATTCACCTTTTC TTCTTACTACATGGGTTGGGTCCGCCAGGCTCCAGG GAAGGGGCTGGAGTGGGTCTCAGGTATTGGTTCTTA CTACGGTTACACAGGTTATGCAGACTCCGTGAAGGG CCGGTTCACCATCTCCCGTGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGCGTGCCGAGGA CACGGCTGTATATTATTGTGCGCGCGCTTACTACGA CTACAACTACTACTACGCTTACTTTGACTATTGGGGC CAGGGAACCCTGGTCACCGTCTCCTCAGGTGGAGG CGGTTCAGGCGGAGGTGGATCCGGCGGTGGCGGAT CGGACATCCAGATGACCCAGTCTCCATCCTCCCTGA GCGCATCTGTAGGAGACCGCGTCACCATCACTTGCC GGGCAAGTCAGAGCATTAGCAGCTATTTAAATTGGT ATCAGCAGAAACCAGGGAAAGCCCCTAAGCTCCTGA TCTATGCTGCATCCAGTTTGCAAAGTGGGGTCCCAT CACGTTTCAGTGGCAGTGGAAGCGGGACAGATTTCA CTCTCACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGTCTGTTCCGCACTACCC GTTCACTTTTGGCCAGGGGACCAAGCTGGAGATCAA ACGC 153 Fusion of: EVQLLESGGGLVQPGGSLRLSCAASGFTFSGSSMSW VH1: 1168 (bold VRQAPGKGLEWVSSISYYGGYTYYADSVKGRFTISRD underlined) NSKNTLYLQMNSLRAEDTAVYYCARYFPHYYFDYWG IgG1 constant QGTLVTVSS ASTKGPSVFPLAPSSKSTSGGTAALGCLV domains (italics) KDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLS Linker SVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCD (underlined) KTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEV VH2: 1204 (bold) TCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQ YNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIE KTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKG FYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSK LTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSP GK GGGGSGGGGSGGGGS EVQLLESGGGLVQPGGSL RLSCAASGFTFSSYYMGWVRQAPGKGLEWVSGIGSY YGYTGYADSVKGRFTISRDNSKNTLYLQMNSLRAEDT AVYYCARAYYDYNYYYAYFDYWGQGTLVTVSS GGGG SGGGGSGGGGS

This sequence typically expressed together with a light chain sequence comprising VL1 1135 (SEQ ID NO: 97) fused to kappa sequence (SEQ ID NO: 136) to assemble a 1168/1135-1204/1205 bispecific antibody. 154 Nucleotide GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGT sequence ACAGCCTGGGGGGTCCCTGCGCCTCTCCTGTGCAG encoding SEQ ID CCAGCGGATTCACCTTTAGTGGTTCTTCTATGTCTTG NO: 153 GGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTGG GTCTCATCTATTTCTTACTACGGTGGTTACACATACT ATGCAGACTCCGTGAAGGGCCGGTTCACCATCTCCC GTGACAATTCCAAGAACACGCTGTATCTGCAAATGA ACAGCCTGCGTGCCGAGGACACGGCTGTATATTATT GTGCGCGCTACTTCCCGCATTACTACTTTGACTATTG GGGCCAGGGAACCCTGGTCACCGTCTCCTCAGGTG AGTTaaCgtacgctagcaagctttctggggcaggccaggcctgaccttgg ctttggggcagggagggggctaaggtgaggcaggtggcgccagccaggtg cacacccaatgcccatgagcccagacactggacgctgaacctcgcggaca gttaagaacccaggggcctctgcgccctgggcccagctctgtcccacaccg cggtcacatggcaccacctctcttgcagCCTCCACCAAGGGCCCA TCGGTCTTCCCCCTGGCACCCTCCTCCAAGAGCACC TCTGGGGGCACAGCGGCCCTGGGCTGCCTGGTCAA GGACTACTTCCCCGAACCGGTGACGGTGTCGTGGA ACTCAGGCGCCCTGACCAGCGGCGTGCACACCTTC CCGGCTGTCCTACAGTCCTCAGGACTCTACTCCCTC AGCAGCGTGGTGACCGTGCCCTCCAGCAGCTTGGG CACCCAGACCTACATCTGCAACGTGAATCACAAGCC CAGCAACACCAAGGTGGACAAGAAAGTTGgtgagaggc cagcacagggagggagggtgtctgctggaagccaggctcagcgctcctgc ctggacgcatcccggctatgcagccccagtccagggcagcaaggcaggcc ccgtctgcctcttcacccggaggcctctgcccgccccactcatgctcagggag agggtcttctggctttttccccaggctctgggcaggcacaggctaggtgcccct aacccaggccctgcacacaaaggggcaggtgctgggctcagacctgcca agagccatatccgggaggaccctgcccctgacctaagcccaccccaaagg ccaaactctccactccctcagctcggacaccttctctcctcccagattccagta actcccaatcttctctctgcagAGCCCAAATCTTGTGACAAAAC TCACACATGCCCACCGTGCCCAGgtaagccagcccaggcct cgccctccagctcaaggcgggacaggtgccctagagtagcctgcatccagg gacaggccccagccgggtgctgacacgtccacctccatctcttcctcagCA CCTGAACTCCTGGGGGGACCGTCAGTCTTCCTCTTC CCCCCAAAACCCAAGGACACCCTCATGATCTCCCGG ACCCCTGAGGTCACATGCGTGGTGGTGGACGTGAG CCACGAAGACCCTGAGGTCAAGTTCAACTGGTACGT GGACGGCGTGGAGGTGCATAATGCCAAGACAAAGC CGCGGGAGGAGCAGTACAACAGCACGTACCGTGTG GTCAGCGTCCTCACCGTCCTGCACCAGGACTGGCT GAATGGCAAGGAGTACAAGTGCAAGGTCTCCAACAA AGCCCTCCCAGCCCCCATCGAGAAAACCATCTCCAA AGCCAAAGgtgggacccgtggggtgcgagggccacatggacagagg ccggctcggcccaccctctgccctgagagtgaccgctgtaccaacctctgtcc ctacagGGCAGCCCCGAGAACCACAGGTGTACACCCT GCCCCCATCCCGGGATGAGCTGACCAAGAACCAGG TCAGCCTGACCTGCCTGGTCAAAGGCTTCTATCCCA GCGACATCGCCGTGGAGTGGGAGAGCAATGGGCAG CCGGAGAACAACTACAAGACCACGCCTCCCGTGCT GGACTCCGACGGCTCCTTCTTCCTCTACAGCAAGCT CACCGTGGACAAGAGCAGGTGGCAGCAGGGGAACG TCTTCTCATGCTCCGTGATGCATGAGGCTCTGCACA ACCACTACACGCAGAAGAGCCTCTCCCTGTCTCCGG GTAAAGGAGGAGGAGGAAGCGGAGGAGGAGGAAG CGGAGGAGGAGGAAGCGAGGTGCAGCTGCTCGAGA GCGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCT GCGCCTCTCCTGTGCAGCCAGCGGATTCACCTTTTC TTCTTACTACATGGGTTGGGTCCGCCAGGCTCCAGG GAAGGGGCTGGAGTGGGTCTCAGGTATTGGTTCTTA CTACGGTTACACAGGTTATGCAGACTCCGTGAAGGG CCGGTTCACCATCTCCCGTGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGCGTGCCGAGGA CACGGCTGTATATTATTGTGCGCGCGCTTACTACGA CTACAACTACTACTACGCTTACTTTGACTATTGGGGC CAGGGAACCCTGGTCACCGTCTCCTCAGGTGGAGG CGGTTCAGGCGGAGGTGGATCCGGCGGTGGCGGAT CGGACATCCAGATGACCCAGTCTCCATCCTCCCTGA GCGCATCTGTAGGAGACCGCGTCACCATCACTTGCC GGGCAAGTCAGAGCATTAGCAGCTATTTAAATTGGT ATCAGCAGAAACCAGGGAAAGCCCCTAAGCTCCTGA TCTATGCTGCATCCAGTTTGCAAAGTGGGGTCCCAT CACGTTTCAGTGGCAGTGGAAGCGGGACAGATTTCA CTCTCACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGTCTGTTCCGCACTACCC GTTCACTTTTGGCCAGGGGACCAAGCTGGAGATCAA ACGC 155 Fusion of: EVQLLESGGGLVQPGGSLRLSCAASGFTFGGYYMSW VH1: 1170 (bold VRQAPGKGLEWVSYIPGSGGSTYYADSVKGRFTISRD underlined) NSKNTLYLQMNSLRAEDTAVYYCARYDYYWMDYWG IgG1 constant QGTLVTVSS ASTKGPSVFPLAPSSKSTSGGTAALGCLV domains (italics) KDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLS Linker SVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCD (underlined) KTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEV VH2: 1204 (bold) TCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQ VL2: 1205 (bold, YNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIE italics) KTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKG FYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSK LTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSP GK GGGGSGGGGSGGGGS EVQLLESGGGLVQPGGSL RLSCAASGFTFSSYYMGWVRQAPGKGLEWVSGIGSY YGYTGYADSVKGRFTISRDNSKNTLYLQMNSLRAEDT AVYYCARAYYDYNYYYAYFDYWGQGTLVTVSS GGGG SGGGGSGGGGS

This sequence typically expressed together with a light chain sequence comprising VL1 1171 (SEQ ID NO: 93) fused to kappa sequence (SEQ ID NO: 136) to assemble a 1170/1171-1204/1205 bispecific antibody. 156 Nucleotide GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGT sequence ACAGCCTGGGGGGTCCCTGCGCCTCTCCTGTGCAG encoding SEQ ID CCAGCGGATTCACCTTTGGTGGTTACTACATGTCTT NO: 155 GGGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTG GGTCTCATACATTCCTGGTTCTGGTGGTTCTACATAC TATGCAGACTCCGTGAAGGGCCGGTTCACCATCTCC CGTGACAATTCCAAGAACACGCTGTATCTGCAAATG AACAGCCTGCGTGCCGAGGACACGGCTGTATATTAT TGTGCGCGCTACGACTACTACTGGATGGACTATTGG GGCCAGGGAACCCTGGTCACCGTCTCCTCAGGTGA GTTaaCgtacgctagcaagctttctggggcaggccaggcctgaccttggct ttggggcagggagggggctaaggtgaggcaggtggcgccagccaggtgc acacccaatgcccatgagcccagacactggacgctgaacctcgcggacag ttaagaacccaggggcctctgcgccctgggcccagctctgtcccacaccgc ggtcacatggcaccacctctcttgcagCCTCCACCAAGGGCCCA TCGGTCTTCCCCCTGGCACCCTCCTCCAAGAGCACC TCTGGGGGCACAGCGGCCCTGGGCTGCCTGGTCAA GGACTACTTCCCCGAACCGGTGACGGTGTCGTGGA ACTCAGGCGCCCTGACCAGCGGCGTGCACACCTTC CCGGCTGTCCTACAGTCCTCAGGACTCTACTCCCTC AGCAGCGTGGTGACCGTGCCCTCCAGCAGCTTGGG CACCCAGACCTACATCTGCAACGTGAATCACAAGCC CAGCAACACCAAGGTGGACAAGAAAGTTGgtgagaggc cagcacagggagggagggtgtctgctggaagccaggctcagcgctcctgc ctggacgcatcccggctatgcagccccagtccagggcagcaaggcaggcc ccgtctgcctcttcacccggaggcctctgcccgccccactcatgctcagggag agggtcttctggctttttccccaggctctgggcaggcacaggctaggtgcccct aacccaggccctgcacacaaaggggcaggtgctgggctcagacctgcca agagccatatccgggaggaccctgcccctgacctaagcccaccccaaagg ccaaactctccactccctcagctcggacaccttctctcctcccagattccagta actcccaatcttctctctgcagAGCCCAAATCTTGTGACAAAAC TCACACATGCCCACCGTGCCCAGgtaagccagcccaggcct cgccctccagctcaaggcgggacaggtgccctagagtagcctgcatccagg gacaggccccagccgggtgctgacacgtccacctccatctcttcctcagCA CCTGAACTCCTGGGGGGACCGTCAGTCTTCCTCTTC CCCCCAAAACCCAAGGACACCCTCATGATCTCCCGG ACCCCTGAGGTCACATGCGTGGTGGTGGACGTGAG CCACGAAGACCCTGAGGTCAAGTTCAACTGGTACGT GGACGGCGTGGAGGTGCATAATGCCAAGACAAAGC CGCGGGAGGAGCAGTACAACAGCACGTACCGTGTG GTCAGCGTCCTCACCGTCCTGCACCAGGACTGGCT GAATGGCAAGGAGTACAAGTGCAAGGTCTCCAACAA AGCCCTCCCAGCCCCCATCGAGAAAACCATCTCCAA AGCCAAAGgtgggacccgtggggtgcgagggccacatggacagagg ccggctcggcccaccctctgccctgagagtgaccgctgtaccaacctctgtcc ctacagGGCAGCCCCGAGAACCACAGGTGTACACCCT GCCCCCATCCCGGGATGAGCTGACCAAGAACCAGG TCAGCCTGACCTGCCTGGTCAAAGGCTTCTATCCCA GCGACATCGCCGTGGAGTGGGAGAGCAATGGGCAG CCGGAGAACAACTACAAGACCACGCCTCCCGTGCT GGACTCCGACGGCTCCTTCTTCCTCTACAGCAAGCT CACCGTGGACAAGAGCAGGTGGCAGCAGGGGAACG TCTTCTCATGCTCCGTGATGCATGAGGCTCTGCACA ACCACTACACGCAGAAGAGCCTCTCCCTGTCTCCGG GTAAAGGAGGAGGAGGAAGCGGAGGAGGAGGAAG CGGAGGAGGAGGAAGCGAGGTGCAGCTGCTCGAGA GCGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCT GCGCCTCTCCTGTGCAGCCAGCGGATTCACCTTTTC TTCTTACTACATGGGTTGGGTCCGCCAGGCTCCAGG GAAGGGGCTGGAGTGGGTCTCAGGTATTGGTTCTTA CTACGGTTACACAGGTTATGCAGACTCCGTGAAGGG CCGGTTCACCATCTCCCGTGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGCGTGCCGAGGA CACGGCTGTATATTATTGTGCGCGCGCTTACTACGA CTACAACTACTACTACGCTTACTTTGACTATTGGGGC CAGGGAACCCTGGTCACCGTCTCCTCAGGTGGAGG CGGTTCAGGCGGAGGTGGATCCGGCGGTGGCGGAT CGGACATCCAGATGACCCAGTCTCCATCCTCCCTGA GCGCATCTGTAGGAGACCGCGTCACCATCACTTGCC GGGCAAGTCAGAGCATTAGCAGCTATTTAAATTGGT ATCAGCAGAAACCAGGGAAAGCCCCTAAGCTCCTGA TCTATGCTGCATCCAGTTTGCAAAGTGGGGTCCCAT CACGTTTCAGTGGCAGTGGAAGCGGGACAGATTTCA CTCTCACCATCAGCAGTCTGCAACCTGAAGATTTTG CAACTTATTACTGTCAACAGTCTGTTCCGCACTACCC GTTCACTTTTGGCCAGGGGACCAAGCTGGAGATCAA ACGC 157 Fusion of: EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSW VH1: 1482 (bold VRQAPGKGLEWVSYISYYSGYTYYADSVKGRFTISRD underlined) NSKNTLYLQMNSLRAEDTAVYYCARGYGYLDYWGQ IgG1 constant GTLVTVSS ASTKGPSVFPLAPSSKSTSGGTAALGCLVK domains (italics) DYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSS Linker VVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCDK (underlined) THTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEVT VH2: 1204 (bold) CVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQY VL2: 1205 (bold, NSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEK italics) TISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGF YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKL TVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPG K GGGGSGGGGSGGGGS EVQLLESGGGLVQPGGSLR LSCAASGFTFSSYYMGWVRQAPGKGLEWVSGIGSYY GYTGYADSVKGRFTISRDNSKNTLYLQMNSLRAEDTA VYYCARAYYDYNYYYAYFDYWGQGTLVTVSS GGGGS GGGGSGGGGS

This sequence typically expressed together with a light chain sequence comprising VL1 1483 (SEQ ID NO: 103) fused to kappa sequence (SEQ ID NO: 136) to assemble a 1482/1483-1204/1205 bispecific antibody. 158 Nucleotide GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGT sequence ACAGCCTGGGGGGTCCCTGCGCCTCTCCTGTGCAG encoding SEQ ID CCAGCGGATTCACCTTTAGCAGCTATGCCATGAGCT NO: 157 GGGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTG GGTCTCATACATTTCTTACTACTCTGGTTACACATAC TATGCAGACTCCGTGAAGGGCCGGTTCACCATCTCC CGTGACAATTCCAAGAACACGCTGTATCTGCAAATG AACAGCCTGCGTGCCGAGGACACGGCTGTATATTAT TGTGCGCGCGGTTACGGTTACTTGGACTATTGGGGC CAGGGAACCCTGGTCACCGTCTCCTCAGGTGAGTTa aCgtacgctagcaagctttctggggcaggccaggcctgaccttggctttggg gcagggagggggctaaggtgaggcaggtggcgccagccaggtgcacac ccaatgcccatgagcccagacactggacgctgaacctcgcggacagttaa gaacccaggggcctctgcgccctgggcccagctctgtcccacaccgcggtc acatggcaccacctctcttgcagCCTCCACCAAGGGCCCATCG GTCTTCCCCCTGGCACCCTCCTCCAAGAGCACCTCT GGGGGCACAGCGGCCCTGGGCTGCCTGGTCAAGG ACTACTTCCCCGAACCGGTGACGGTGTCGTGGAACT CAGGCGCCCTGACCAGCGGCGTGCACACCTTCCCG GCTGTCCTACAGTCCTCAGGACTCTACTCCCTCAGC AGCGTGGTGACCGTGCCCTCCAGCAGCTTGGGCAC CCAGACCTACATCTGCAACGTGAATCACAAGCCCAG CAACACCAAGGTGGACAAGAAAGTTGgtgagaggccagc acagggagggagggtgtctgctggaagccaggctcagcgctcctgcctgga cgcatcccggctatgcagccccagtccagggcagcaaggcaggccccgtc tgcctcttcacccggaggcctctgcccgccccactcatgctcagggagaggg tcttctggctttttccccaggctctgggcaggcacaggctaggtgcccctaacc caggccctgcacacaaaggggcaggtgctgggctcagacctgccaagag ccatatccgggaggaccctgcccctgacctaagcccaccccaaaggccaa actctccactccctcagctcggacaccttctctcctcccagattccagtaactcc caatcttctctctgcagAGCCCAAATCTTGTGACAAAACTCAC ACATGCCCACCGTGCCCAGgtaagccagcccaggcctcgccct ccagctcaaggcgggacaggtgccctagagtagcctgcatccagggacag gccccagccgggtgctgacacgtccacctccatctcttcctcagCACCTG AACTCCTGGGGGGACCGTCAGTCTTCCTCTTCCCCC CAAAACCCAAGGACACCCTCATGATCTCCCGGACCC CTGAGGTCACATGCGTGGTGGTGGACGTGAGCCAC GAAGACCCTGAGGTCAAGTTCAACTGGTACGTGGAC GGCGTGGAGGTGCATAATGCCAAGACAAAGCCGCG GGAGGAGCAGTACAACAGCACGTACCGTGTGGTCA GCGTCCTCACCGTCCTGCACCAGGACTGGCTGAAT GGCAAGGAGTACAAGTGCAAGGTCTCCAACAAAGCC CTCCCAGCCCCCATCGAGAAAACCATCTCCAAAGCC AAAGgtgggacccgtggggtgcgagggccacatggacagaggccggct cggcccaccctctgccctgagagtgaccgctgtaccaacctctgtccctacag GGCAGCCCCGAGAACCACAGGTGTACACCCTGCCC CCATCCCGGGATGAGCTGACCAAGAACCAGGTCAG CCTGACCTGCCTGGTCAAAGGCTTCTATCCCAGCGA CATCGCCGTGGAGTGGGAGAGCAATGGGCAGCCGG AGAACAACTACAAGACCACGCCTCCCGTGCTGGACT CCGACGGCTCCTTCTTCCTCTACAGCAAGCTCACCG TGGACAAGAGCAGGTGGCAGCAGGGGAACGTCTTC TCATGCTCCGTGATGCATGAGGCTCTGCACAACCAC TACACGCAGAAGAGCCTCTCCCTGTCTCCGGGTAAA GGAGGAGGAGGAAGCGGAGGAGGAGGAAGCGGAG GAGGAGGAAGCGAGGTGCAGCTGCTCGAGAGCGG GGGAGGCTTGGTACAGCCTGGGGGGTCCCTGCGCC TCTCCTGTGCAGCCAGCGGATTCACCTTTTCTTCTTA CTACATGGGTTGGGTCCGCCAGGCTCCAGGGAAGG GGCTGGAGTGGGTCTCAGGTATTGGTTCTTACTACG GTTACACAGGTTATGCAGACTCCGTGAAGGGCCGGT TCACCATCTCCCGTGACAATTCCAAGAACACGCTGT ATCTGCAAATGAACAGCCTGCGTGCCGAGGACACG GCTGTATATTATTGTGCGCGCGCTTACTACGACTACA ACTACTACTACGCTTACTTTGACTATTGGGGCCAGG GAACCCTGGTCACCGTCTCCTCAGGTGGAGGCGGT TCAGGCGGAGGTGGATCCGGCGGTGGCGGATCGG ACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCG CATCTGTAGGAGACCGCGTCACCATCACTTGCCGGG CAAGTCAGAGCATTAGCAGCTATTTAAATTGGTATCA GCAGAAACCAGGGAAAGCCCCTAAGCTCCTGATCTA TGCTGCATCCAGTTTGCAAAGTGGGGTCCCATCACG TTTCAGTGGCAGTGGAAGCGGGACAGATTTCACTCT CACCATCAGCAGTCTGCAACCTGAAGATTTTGCAAC TTATTACTGTCAACAGTCTGTTCCGCACTACCCGTTC ACTTTTGGCCAGGGGACCAAGCTGGAGATCAAACGC 159 Fusion of: EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSW VH1: 1520 (bold VRQAPGKGLEWVSAISGSGGSTYYADSVKGRFTISRD underlined) NSKNTLYLQMNSLRAEDTAVYYCARYYYSHGYYVYG IgG1 constant TLDYWGQGTLVTVSS ASTKGPSVFPLAPSSKSTSGGT domains (italics) AALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS Linker SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKK (underlined) VEPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTLM VH2: 1204 (bold) ISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT VL2: 1205 (bold, KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNK italics) ALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSL TCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDG SFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQK SLSLSPGK GGGGSGGGGSGGGGS EVQLLESGGGLV QPGGSLRLSCAASGFTFSSYYMGWVRQAPGKGLEW VSGIGSYYGYTGYADSVKGRFTISRDNSKNTLYLQMN SLRAEDTAVYYCARAYYDYNYYYAYFDYWGQGTLVT VSS GGGGSGGGGSGGGGS

This sequence typically expressed together with a light chain sequence comprising VL1 1135 (SEQ ID NO: 97) fused to kappa sequence (SEQ ID NO: 136) to assemble a 1520/1135-1204/1205 bispecific antibody. 160 Nucleotide GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGT sequence ACAGCCTGGGGGGTCCCTGCGCCTCTCCTGTGCAG encoding SEQ ID CCAGCGGATTCACCTTTAGCAGCTATGCCATGAGCT NO: 159 GGGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTG GGTCTCAGCTATTAGTGGTAGTGGTGGTAGCACATA CTATGCAGACTCCGTGAAGGGCCGGTTCACCATCTC CCGTGACAATTCCAAGAACACGCTGTATCTGCAAAT GAACAGCCTGCGTGCCGAGGACACGGCTGTATATTA TTGTGCGCGCTACTACTACTCTCATGGTTACTACGTT TACGGTACTTTGGACTATTGGGGCCAGGGAACCCTG GTCACCGTCTCCTCAGGTGAGTTaaCgtacgctagcaagctt tctggggcaggccaggcctgaccttggctttggggcagggagggggctaag gtgaggcaggtggcgccagccaggtgcacacccaatgcccatgagccca gacactggacgctgaacctcgcggacagttaagaacccaggggcctctgc gccctgggcccagctctgtcccacaccgcggtcacatggcaccacctctcttg cagCCTCCACCAAGGGCCCATCGGTCTTCCCCCTGG CACCCTCCTCCAAGAGCACCTCTGGGGGCACAGCG GCCCTGGGCTGCCTGGTCAAGGACTACTTCCCCGA ACCGGTGACGGTGTCGTGGAACTCAGGCGCCCTGA CCAGCGGCGTGCACACCTTCCCGGCTGTCCTACAG TCCTCAGGACTCTACTCCCTCAGCAGCGTGGTGACC GTGCCCTCCAGCAGCTTGGGCACCCAGACCTACATC TGCAACGTGAATCACAAGCCCAGCAACACCAAGGTG GACAAGAAAGTTGgtgagaggccagcacagggagggagggtgtc tgctggaagccaggctcagcgctcctgcctggacgcatcccggctatgcagc cccagtccagggcagcaaggcaggccccgtctgcctcttcacccggaggc ctctgcccgccccactcatgctcagggagagggtcttctggctttttccccagg ctctgggcaggcacaggctaggtgcccctaacccaggccctgcacacaaa ggggcaggtgctgggctcagacctgccaagagccatatccgggaggaccc tgcccctgacctaagcccaccccaaaggccaaactctccactccctcagctc ggacaccttctctcctcccagattccagtaactcccaatcttctctctgcagAG CCCAAATCTTGTGACAAAACTCACACATGCCCACCG TGCCCAGgtaagccagcccaggcctcgccctccagctcaaggcggga caggtgccctagagtagcctgcatccagggacaggccccagccgggtgct gacacgtccacctccatctcttcctcagCACCTGAACTCCTGGGG GGACCGTCAGTCTTCCTCTTCCCCCCAAAACCCAAG GACACCCTCATGATCTCCCGGACCCCTGAGGTCACA TGCGTGGTGGTGGACGTGAGCCACGAAGACCCTGA GGTCAAGTTCAACTGGTACGTGGACGGCGTGGAGG TGCATAATGCCAAGACAAAGCCGCGGGAGGAGCAG TACAACAGCACGTACCGTGTGGTCAGCGTCCTCACC GTCCTGCACCAGGACTGGCTGAATGGCAAGGAGTA CAAGTGCAAGGTCTCCAACAAAGCCCTCCCAGCCCC CATCGAGAAAACCATCTCCAAAGCCAAAGgtgggacccg tggggtgcgagggccacatggacagaggccggctcggcccaccctctgcc ctgagagtgaccgctgtaccaacctctgtccctacagGGCAGCCCCG AGAACCACAGGTGTACACCCTGCCCCCATCCCGGG ATGAGCTGACCAAGAACCAGGTCAGCCTGACCTGCC TGGTCAAAGGCTTCTATCCCAGCGACATCGCCGTGG AGTGGGAGAGCAATGGGCAGCCGGAGAACAACTAC AAGACCACGCCTCCCGTGCTGGACTCCGACGGCTC CTTCTTCCTCTACAGCAAGCTCACCGTGGACAAGAG CAGGTGGCAGCAGGGGAACGTCTTCTCATGCTCCG TGATGCATGAGGCTCTGCACAACCACTACACGCAGA AGAGCCTCTCCCTGTCTCCGGGTAAAGGAGGAGGA GGAAGCGGAGGAGGAGGAAGCGGAGGAGGAGGAA GCGAGGTGCAGCTGCTCGAGAGCGGGGGAGGCTT GGTACAGCCTGGGGGGTCCCTGCGCCTCTCCTGTG CAGCCAGCGGATTCACCTTTTCTTCTTACTACATGGG TTGGGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGT GGGTCTCAGGTATTGGTTCTTACTACGGTTACACAG GTTATGCAGACTCCGTGAAGGGCCGGTTCACCATCT CCCGTGACAATTCCAAGAACACGCTGTATCTGCAAA TGAACAGCCTGCGTGCCGAGGACACGGCTGTATATT ATTGTGCGCGCGCTTACTACGACTACAACTACTACTA CGCTTACTTTGACTATTGGGGCCAGGGAACCCTGGT CACCGTCTCCTCAGGTGGAGGCGGTTCAGGCGGAG GTGGATCCGGCGGTGGCGGATCGGACATCCAGATG ACCCAGTCTCCATCCTCCCTGAGCGCATCTGTAGGA GACCGCGTCACCATCACTTGCCGGGCAAGTCAGAG CATTAGCAGCTATTTAAATTGGTATCAGCAGAAACCA GGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGC AGTGGAAGCGGGACAGATTTCACTCTCACCATCAGC AGTCTGCAACCTGAAGATTTTGCAACTTATTACTGTC AACAGTCTGTTCCGCACTACCCGTTCACTTTTGGCC AGGGGACCAAGCTGGAGATCAAACGC 161 Fusion of: EVQLLESGGGLVQPGGSLRLSCAASGFTFSGYSMYW VH1: 1526 (bold VRQAPGKGLEWVSGIGYSGYGTYYADSVKGRFTISRD underlined) NSKNTLYLQMNSLRAEDTAVYYCARYYFHDYAAYSL IgG1 constant DYWGQGTLVTVSS ASTKGPSVFPLAPSSKSTSGGTAA domains (italics) LGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSG Linker LYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVE (underlined) PKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTLMIS VH2: 1204 (bold) RTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKP VL2: 1205 (bold, REEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKAL italics) PAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTC LVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSF FLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSL SLSPGK GGGGSGGGGSGGGGS EVQLLESGGGLVQP GGSLRLSCAASGFTFSSYYMGWVRQAPGKGLEWVS GIGSYYGYTGYADSVKGRFTISRDNSKNTLYLQMNSL RAEDTAVYYCARAYYDYNYYYAYFDYWGQGTLVTVS S GGGGSGGGGSGGGGS

This sequence typically expressed together with a light chain sequence comprising VL1 1527 (SEQ ID NO: 119) fused to kappa sequence (SEQ ID NO: 136) to assemble a 1526/1527-1204/1205 bispecific antibody. 162 Nucleotide GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGT sequence ACAGCCTGGGGGGTCCCTGCGCCTCTCCTGTGCAG encoding SEQ ID CCAGCGGATTCACCTTTTCTGGTTACTCTATGTACTG NO: 161 GGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTGG GTCTCAGGTATTGGTTACTCTGGTTACGGTACATACT ATGCAGACTCCGTGAAGGGCCGGTTCACCATCTCCC GTGACAATTCCAAGAACACGCTGTATCTGCAAATGA ACAGCCTGCGTGCCGAGGACACGGCTGTATATTATT GTGCGCGCTACTACTTCCATGACTACGCTGCTTACT CTTTGGACTATTGGGGCCAGGGAACCCTGGTCACC GTCTCCTCA GGTGAGTTaaCgtacgctagcaagctttctggggcaggccaggcctg accttggctttggggcagggagggggctaaggtgaggcaggtggcgccag ccaggtgcacacccaatgcccatgagcccagacactggacgctgaacctc gcggacagttaagaacccaggggcctctgcgccctgggcccagctctgtcc cacaccgcggtcacatggcaccacctctcttgcagCCTCCACCAAG GGCCCATCGGTCTTCCCCCTGGCACCCTCCTCCAAG AGCACCTCTGGGGGCACAGCGGCCCTGGGCTGCCT GGTCAAGGACTACTTCCCCGAACCGGTGACGGTGT CGTGGAACTCAGGCGCCCTGACCAGCGGCGTGCAC ACCTTCCCGGCTGTCCTACAGTCCTCAGGACTCTAC TCCCTCAGCAGCGTGGTGACCGTGCCCTCCAGCAG CTTGGGCACCCAGACCTACATCTGCAACGTGAATCA CAAGCCCAGCAACACCAAGGTGGACAAGAAAGTTGg tgagaggccagcacagggagggagggtgtctgctggaagccaggctcag cgctcctgcctggacgcatcccggctatgcagccccagtccagggcagcaa ggcaggccccgtctgcctcttcacccggaggcctctgcccgccccactcatg ctcagggagagggtcttctggctttttccccaggctctgggcaggcacaggct aggtgcccctaacccaggccctgcacacaaaggggcaggtgctgggctca gacctgccaagagccatatccgggaggaccctgcccctgacctaagccca ccccaaaggccaaactctccactccctcagctcggacaccttctctcctccca gattccagtaactcccaatcttctctctgcagAGCCCAAATCTTGTGA CAAAACTCACACATGCCCACCGTGCCCAGgtaagccag cccaggcctcgccctccagctcaaggcgggacaggtgccctagagtagcct gcatccagggacaggccccagccgggtgctgacacgtccacctccatctctt cctcagCACCTGAACTCCTGGGGGGACCGTCAGTOTT CCTCTTCCCCCCAAAACCCAAGGACACCCTCATGAT CTCCCGGACCCCTGAGGTCACATGCGTGGTGGTGG ACGTGAGCCACGAAGACCCTGAGGTCAAGTTCAACT GGTACGTGGACGGCGTGGAGGTGCATAATGCCAAG ACAAAGCCGCGGGAGGAGCAGTACAACAGCACGTA CCGTGTGGTCAGCGTCCTCACCGTCCTGCACCAGG ACTGGCTGAATGGCAAGGAGTACAAGTGCAAGGTCT CCAACAAAGCCCTCCCAGCCCCCATCGAGAAAACCA TCTCCAAAGCCAAAGgtgggacccgtggggtgcgagggccacat ggacagaggccggctcggcccaccctctgccctgagagtgaccgctgtacc aacctctgtccctacagGGCAGCCCCGAGAACCACAGGTGT ACACCCTGCCCCCATCCCGGGATGAGCTGACCAAG AACCAGGTCAGCCTGACCTGCCTGGTCAAAGGCTTC TATCCCAGCGACATCGCCGTGGAGTGGGAGAGCAA TGGGCAGCCGGAGAACAACTACAAGACCACGCCTC CCGTGCTGGACTCCGACGGCTCCTTCTTCCTCTACA GCAAGCTCACCGTGGACAAGAGCAGGTGGCAGCAG GGGAACGTCTTCTCATGCTCCGTGATGCATGAGGCT CTGCACAACCACTACACGCAGAAGAGCCTCTCCCTG TCTCCGGGTAAAGGAGGAGGAGGAAGCGGAGGAGG AGGAAGCGGAGGAGGAGGAAGCGAGGTGCAGCTG CTCGAGAGCGGGGGAGGCTTGGTACAGCCTGGGG GGTCCCTGCGCCTCTCCTGTGCAGCCAGCGGATTC ACCTTTTCTTCTTACTACATGGGTTGGGTCCGCCAG GCTCCAGGGAAGGGGCTGGAGTGGGTCTCAGGTAT TGGTTCTTACTACGGTTACACAGGTTATGCAGACTCC GTGAAGGGCCGGTTCACCATCTCCCGTGACAATTCC AAGAACACGCTGTATCTGCAAATGAACAGCCTGCGT GCCGAGGACACGGCTGTATATTATTGTGCGCGCGCT TACTACGACTACAACTACTACTACGCTTACTTTGACT ATTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA GGTGGAGGCGGTTCAGGCGGAGGTGGATCCGGCG GTGGCGGATCGGACATCCAGATGACCCAGTCTCCAT CCTCCCTGAGCGCATCTGTAGGAGACCGCGTCACC ATCACTTGCCGGGCAAGTCAGAGCATTAGCAGCTAT TTAAATTGGTATCAGCAGAAACCAGGGAAAGCCCCT AAGCTCCTGATCTATGCTGCATCCAGTTTGCAAAGT GGGGTCCCATCACGTTTCAGTGGCAGTGGAAGCGG GACAGATTTCACTCTCACCATCAGCAGTCTGCAACC TGAAGATTTTGCAACTTATTACTGTCAACAGTCTGTT CCGCACTACCCGTTCACTTTTGGCCAGGGGACCAAG CTGGAGATCAAACGC 163 Fusion of: EVQLLESGGGLVQPGGSLRLSCAASGFTFGSSSMYW VH1: 1542 (bold VRQAPGKGLEWVSGIGYYSYSTSYADSVKGRFTISRD underlined) NSKNTLYLQMNSLRAEDTAVYYCARGYPHHYFDYWG IgG1 constant QGTLVTVSS ASTKGPSVFPLAPSSKSTSGGTAALGCLV domains (italics) KDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLS Linker SVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCD (underlined) KTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEV VH2: 1204 (bold) TCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQ VL2: 1205 (bold, YNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIE italics) KTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKG FYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSK LTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSP GK GGGGSGGGGSGGGGS EVQLLESGGGLVQPGGSL RLSCAASGFTFSSYYMGWVRQAPGKGLEWVSGIGSY YGYTGYADSVKGRFTISRDNSKNTLYLQMNSLRAEDT AVYYCARAYYDYNYYYAYFDYWGQGTLVTVSS GGGG SGGGGSGGGGS

This sequence typically expressed together with a light chain sequence comprising VL1 1135 (SEQ ID NO: 97) fused to kappa sequence (SEQ ID NO: 136) to assemble a 1542/1135-1204/1205 bispecific antibody. 164 Nucleotide GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGT sequence ACAGCCTGGGGGGTCCCTGCGCCTCTCCTGTGCAG encoding SEQ ID CCAGCGGATTCACCTTTGGTTCTTCTTCTATGTACTG NO: 163 GGTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTGG GTCTCAGGTATTGGTTACTACTCTTACTCTACATCTT ATGCAGACTCCGTGAAGGGCCGGTTCACCATCTCCC GTGACAATTCCAAGAACACGCTGTATCTGCAAATGA ACAGCCTGCGTGCCGAGGACACGGCTGTATATTATT GTGCGCGCGGTTACCCGCATCATTACTTTGACTATT GGGGCCAGGGAACCCTGGTCACCGTCTCCTCAGGT GAGTTaaCgtacgctagcaagctttctggggcaggccaggcctgacctt ggctttggggcagggagggggctaaggtgaggcaggtggcgccagccag gtgcacacccaatgcccatgagcccagacactggacgctgaacctcgcgg acagttaagaacccaggggcctctgcgccctgggcccagctctgtcccaca ccgcggtcacatggcaccacctctcttgcagCCTCCACCAAGGGC CCATCGGTCTTCCCCCTGGCACCCTCCTCCAAGAGC ACCTCTGGGGGCACAGCGGCCCTGGGCTGCCTGGT CAAGGACTACTTCCCCGAACCGGTGACGGTGTCGT GGAACTCAGGCGCCCTGACCAGCGGCGTGCACACC TTCCCGGCTGTCCTACAGTCCTCAGGACTCTACTCC CTCAGCAGCGTGGTGACCGTGCCCTCCAGCAGCTT GGGCACCCAGACCTACATCTGCAACGTGAATCACAA GCCCAGCAACACCAAGGTGGACAAGAAAGTTGgtgag aggccagcacagggagggagggtgtctgctggaagccaggctcagcgctc ctgcctggacgcatcccggctatgcagccccagtccagggcagcaaggca ggccccgtctgcctcttcacccggaggcctctgcccgccccactcatgctcag ggagagggtcttctggctttttccccaggctctgggcaggcacaggctaggtg cccctaacccaggccctgcacacaaaggggcaggtgctgggctcagacct gccaagagccatatccgggaggaccctgcccctgacctaagcccacccca aaggccaaactctccactccctcagctcggacaccttctctcctcccagattcc agtaactcccaatcttctctctgcagAGCCCAAATCTTGTGACAA AACTCACACATGCCCACCGTGCCCAGgtaagccagccca ggcctcgccctccagctcaaggcgggacaggtgccctagagtagcctgcat ccagggacaggccccagccgggtgctgacacgtccacctccatctcttcctc agCACCTGAACTCCTGGGGGGACCGTCAGTCTTCCT CTTCCCCCCAAAACCCAAGGACACCCTCATGATCTC CCGGACCCCTGAGGTCACATGCGTGGTGGTGGACG TGAGCCACGAAGACCCTGAGGTCAAGTTCAACTGGT ACGTGGACGGCGTGGAGGTGCATAATGCCAAGACA AAGCCGCGGGAGGAGCAGTACAACAGCACGTACCG TGTGGTCAGCGTCCTCACCGTCCTGCACCAGGACTG GCTGAATGGCAAGGAGTACAAGTGCAAGGTCTCCAA CAAAGCCCTCCCAGCCCCCATCGAGAAAACCATCTC CAAAGCCAAAGgtgggacccgtggggtgcgagggccacatggaca gaggccggctcggcccaccctctgccctgagagtgaccgctgtaccaacct ctgtccctacagGGCAGCCCCGAGAACCACAGGTGTACA CCCTGCCCCCATCCCGGGATGAGCTGACCAAGAAC CAGGTCAGCCTGACCTGCCTGGTCAAAGGCTTCTAT CCCAGCGACATCGCCGTGGAGTGGGAGAGCAATGG GCAGCCGGAGAACAACTACAAGACCACGCCTCCCG TGCTGGACTCCGACGGCTCCTTCTTCCTCTACAGCA AGCTCACCGTGGACAAGAGCAGGTGGCAGCAGGGG AACGTCTTCTCATGCTCCGTGATGCATGAGGCTCTG CACAACCACTACACGCAGAAGAGCCTCTCCCTGTCT CCGGGTAAAGGAGGAGGAGGAAGCGGAGGAGGAG GAAGCGGAGGAGGAGGAAGCGAGGTGCAGCTGCTC GAGAGCGGGGGAGGCTTGGTACAGCCTGGGGGGT CCCTGCGCCTCTCCTGTGCAGCCAGCGGATTCACCT TTTCTTCTTACTACATGGGTTGGGTCCGCCAGGCTC CAGGGAAGGGGCTGGAGTGGGTCTCAGGTATTGGT TCTTACTACGGTTACACAGGTTATGCAGACTCCGTG AAGGGCCGGTTCACCATCTCCCGTGACAATTCCAAG AACACGCTGTATCTGCAAATGAACAGCCTGCGTGCC GAGGACACGGCTGTATATTATTGTGCGCGCGCTTAC TACGACTACAACTACTACTACGCTTACTTTGACTATT GGGGCCAGGGAACCCTGGTCACCGTCTCCTCAGGT GGAGGCGGTTCAGGCGGAGGTGGATCCGGCGGTG GCGGATCGGACATCCAGATGACCCAGTCTCCATCCT CCCTGAGCGCATCTGTAGGAGACCGCGTCACCATCA CTTGCCGGGCAAGTCAGAGCATTAGCAGCTATTTAA ATTGGTATCAGCAGAAACCAGGGAAAGCCCCTAAGC TCCTGATCTATGCTGCATCCAGTTTGCAAAGTGGGG TCCCATCACGTTTCAGTGGCAGTGGAAGCGGGACA GATTTCACTCTCACCATCAGCAGTCTGCAACCTGAA GATTTTGCAACTTATTACTGTCAACAGTCTGTTCCGC ACTACCCGTTCACTTTTGGCCAGGGGACCAAGCTGG AGATCAAACGC

TABLE G Exemplary sequences SEQ ID NO. DESIGNATION SEQUENCE 165 Fusion of: DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQ VL1: 1135 (bold QKPGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLT underlined) ISSLQPEDFATYYCQQSYSTPYTFGQGTKLEIK RTVA kappa constant APSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQW domains (italics) KVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKAD (i.e. fusion of YEKHKVYACEVTHQGLSSPVTKSFNRGEC SEQ ID NOS: 97 May assemble with any one of SEQ ID  and 136) NOs: 149, 153, 159 or 163 to form a  1164/1135-1204/1205, 1168/1135-  1204/1205, 1520/1135-1204/1205 or  1542/1135-1204/1205 bispecific  antibody. 166 Nucleotide GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCG encoding SEQ ID CATCTGTAGGAGACCGCGTCACCATCACTTGCCGGGC NO: 165 AAGTCAGAGCATTAGCAGCTATTTAAATTGGTATCAG CAGAAACCAGGGAAAGCCCCTAAGCTCCTGATCTATG CTGCATCCAGTTTGCAAAGTGGGGTCCCATCACGTTT CAGTGGCAGTGGAAGCGGGACAGATTTCACTCTCACC ATCAGCAGTCTGCAACCTGAAGATTTTGCAACTTATT ACTGTCAACAGAGTTACAGTACCCCTTATACTTTTGG CCAGGGGACCAAGCTGGAGATCAAACgtgagtcgtac gctagcaagcttgatatcgaattctaaactctgaggg ggtcggatgacgtggccattctttgcctaaagcattg agtttactgcaaggtcagaaaagcatgcaaagccctc agaatggctgcaaagagctccaacaaaacaatttaga actttattaaggaatagggggaagctaggaagaaact caaaacatcaagattttaaatacgcttcttggtctcc ttgctataattatctgggataagcatgctgttttctg tctgtccctaacatgccctgtgattatccgcaaacaa cacacccaagggcagaactttgttacttaaacaccat cctgtttgcttctttcctcagGAACTGTGGCTGCACC ATCTGTCTTCATCTTCCCGCCATCTGATGAGCAGTTG AAATCTGGAACTGCCTCTGTTGTGTGCCTGCTGAATA ACTTCTATCCCAGAGAGGCCAAAGTACAGTGGAAGGT GGATAACGCCCTCCAATCGGGTAACTCCCAGGAGAGT GTCACAGAGCAGGACAGCAAGGACAGCACCTACAGCC TCAGCAGCACCCTGACGCTGAGCAAAGCAGACTACGA GAAACACAAAGTCTACGCCTGCGAAGTCACCCATCAG GGCCTGAGCTCGCCCGTCACAAAGAGCTTCAACAGGG GAGAGTGT 167 Fusion of: DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQ VL1: 1167 (bold QKPGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLT underlined) ISSLQPEDFATYYCQQYYWYGLSTFGQGTKLEIK RTV kappa constant AAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQ domains (italics) WKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKA (i.e. fusion of DYEKHKVYACEVTHQGLSSPVTKSFNRGEC SEQ ID NOS: 89 May assemble with SEQ ID NO: 151 to  and 136) form a 1166/1167-1204/1205 bispecific antibody. 168 Nucleotide GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCG encoding SEQ ID CATCTGTAGGAGACCGCGTCACCATCACTTGCCGGGC NO: 167 AAGTCAGAGCATTAGCAGCTATTTAAATTGGTATCAG CAGAAACCAGGGAAAGCCCCTAAGCTCCTGATCTATG CTGCATCCAGTTTGCAAAGTGGGGTCCCATCACGTTT CAGTGGCAGTGGAAGCGGGACAGATTTCACTCTCACC ATCAGCAGTCTGCAACCTGAAGATTTTGCAACTTATT ACTGTCAACAGTACTACTGGTACGGTCTGTCCACTTT TGGCCAGGGGACCAAGCTGGAGATCAAACGTGAGTCg tacgctagcaagcttgatatcgaattctaaactctga gggggtcggatgacgtggccattctttgcctaaagca ttgagtttactgcaaggtcagaaaagcatgcaaagcc ctcagaatggctgcaaagagctccaacaaaacaattt agaactttattaaggaatagggggaagctaggaagaa actcaaaacatcaagattttaaatacgcttcttggtc tccttgctataattatctgggataagcatgctgtttt ctgtctgtccctaacatgccctgtgattatccgcaaa caacacacccaagggcagaactttgttacttaaacac catcctgtttgcttctttcctcagGAACTGTGGCTGC ACCATCTGTCTTCATCTTCCCGCCATCTGATGAGCAG TTGAAATCTGGAACTGCCTCTGTTGTGTGCCTGCTGA ATAACTTCTATCCCAGAGAGGCCAAAGTACAGTGGAA GGTGGATAACGCCCTCCAATCGGGTAACTCCCAGGAG AGTGTCACAGAGCAGGACAGCAAGGACAGCACCTACA GCCTCAGCAGCACCCTGACGCTGAGCAAAGCAGACTA CGAGAAACACAAAGTCTACGCCTGCGAAGTCACCCAT CAGGGCCTGAGCTCGCCCGTCACAAAGAGCTTCAACA GGGGAGAGTGT 169 Fusion of: DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQ VL1: 1171 (bold QKPGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLT underlined) ISSLQPEDFATYYCQQGHGSYPHTFGQGTKLEIK RTV kappa constant AAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQ domains (italics)  WKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKA (i.e. fusion of DYEKHKVYACEVTHQGLSSPVTKSFNRGEC SEQ ID NOS: 93 May assemble with SEQ ID NO: 155 to  and 136) form a 1170/1171-1204/1205 bispecific antibody 170 Nucleotide GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCG encoding SEQ ID CATCTGTAGGAGACCGCGTCACCATCACTTGCCGGGC NO: 169 AAGTCAGAGCATTAGCAGCTATTTAAATTGGTATCAG CAGAAACCAGGGAAAGCCCCTAAGCTCCTGATCTATG CTGCATCCAGTTTGCAAAGTGGGGTCCCATCACGTTT CAGTGGCAGTGGAAGCGGGACAGATTTCACTCTCACC ATCAGCAGTCTGCAACCTGAAGATTTTGCAACTTATT ACTGTCAACAGGGTCATGGTTCTTACCCGCACACTTT TGGCCAGGGGACCAAGCTGGAGATCAAACGTGAGTCg tacgctagcaagcttgatatcgaattctaaactctga gggggtcggatgacgtggccattctttgcctaaagca ttgagtttactgcaaggtcagaaaagcatgcaaagcc ctcagaatggctgcaaagagctccaacaaaacaattt agaactttattaaggaatagggggaagctaggaagaa actcaaaacatcaagattttaaatacgcttcttggtc tccttgctataattatctgggataagcatgctgtttt ctgtctgtccctaacatgccctgtgattatccgcaaa caacacacccaagggcagaactttgttacttaaacac catcctgtttgcttctttcctcagGAACTGTGGCTGC ACCATCTGTCTTCATCTTCCCGCCATCTGATGAGCAG TTGAAATCTGGAACTGCCTCTGTTGTGTGCCTGCTGA ATAACTTCTATCCCAGAGAGGCCAAAGTACAGTGGAA GGTGGATAACGCCCTCCAATCGGGTAACTCCCAGGAG AGTGTCACAGAGCAGGACAGCAAGGACAGCACCTACA GCCTCAGCAGCACCCTGACGCTGAGCAAAGCAGACTA CGAGAAACACAAAGTCTACGCCTGCGAAGTCACCCAT CAGGGCCTGAGCTCGCCCGTCACAAAGAGCTTCAACA GGGGAGAGTGT 171 Fusion of: DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQ VL1: 1483 (bold QKPGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLT underlined) ISSLQPEDFATYYCQQYGSLLTFGQGTKLEIK RTVAA kappa constant PSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWK domains (italics)  VDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADY (i.e. fusion of EKHKVYACEVTHQGLSSPVTKSFNRGEC SEQ ID NOS: May assemble with SEQ ID NO: 157 to  103 and 136) form a 1482/1483-1204/1205 bispecific antibody 172 Nucleotide GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCG encoding SEQ ID CATCTGTAGGAGACCGCGTCACCATCACTTGCCGGGC NO: 171 AAGTCAGAGCATTAGCAGCTATTTAAATTGGTATCAG CAGAAACCAGGGAAAGCCCCTAAGCTCCTGATCTATG CTGCATCCAGTTTGCAAAGTGGGGTCCCATCACGTTT CAGTGGCAGTGGAAGCGGGACAGATTTCACTCTCACC ATCAGCAGTCTGCAACCTGAAGATTTTGCAACTTATT ACTGTCAACAGTACGGTTCTCTGCTCACTTTTGGCCA GGGGACCAAGCTGGAGATCAAACGTGAGTCgtacgct agcaagcttgatatcgaattctaaactctgagggggt cggatgacgtggccattctttgcctaaagcattgagt ttactgcaaggtcagaaaagcatgcaaagccctcaga atggctgcaaagagctccaacaaaacaatttagaact ttattaaggaatagggggaagctaggaagaaactcaa aacatcaagattttaaatacgcttcttggtctccttg ctataattatctgggataagcatgctgttttctgtct gtccctaacatgccctgtgattatccgcaaacaacac acccaagggcagaactttgttacttaaacaccatcct gtttgcttctttcctcagGAACTGTGGCTGCACCATC TGTCTTCATCTTCCCGCCATCTGATGAGCAGTTGAAA TCTGGAACTGCCTCTGTTGTGTGCCTGCTGAATAACT TCTATCCCAGAGAGGCCAAAGTACAGTGGAAGGTGGA TAACGCCCTCCAATCGGGTAACTCCCAGGAGAGTGTC ACAGAGCAGGACAGCAAGGACAGCACCTACAGCCTCA GCAGCACCCTGACGCTGAGCAAAGCAGACTACGAGAA ACACAAAGTCTACGCCTGCGAAGTCACCCATCAGGGC CTGAGCTCGCCCGTCACAAAGAGCTTCAACAGGGGAG AGTGT 173 Fusion of: DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQ VL1: 1527 (bold QKPGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLT underlined) ISSLQPEDFATYYCQQYGSDSLLTFGQGTKLEIK RTV kappa constant AAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQ domains (italics)  WKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKA (i.e. fusion of DYEKHKVYACEVTHQGLSSPVTKSFNRGEC SEQ ID NOS: May assemble with SEQ ID NO: 161 to  119 and 136) form 1526/1527-1204/1205 bispecific  antibody 174 Nucleotide GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCG encoding SEQ ID CATCTGTAGGAGACCGCGTCACCATCACTTGCCGGGC NO: 173 AAGTCAGAGCATTAGCAGCTATTTAAATTGGTATCAG CAGAAACCAGGGAAAGCCCCTAAGCTCCTGATCTATG CTGCATCCAGTTTGCAAAGTGGGGTCCCATCACGTTT CAGTGGCAGTGGAAGCGGGACAGATTTCACTCTCACC ATCAGCAGTCTGCAACCTGAAGATTTTGCAACTTATT ACTGTCAACAGTACGGTTCTGATTCTCTGCTCACTTT TGGCCAGGGGACCAAGCTGGAGATCAAACGTGAGTCg tacgctagcaagcttgatatcgaattctaaactctga gggggtcggatgacgtggccattctttgcctaaagca ttgagtttactgcaaggtcagaaaagcatgcaaagcc ctcagaatggctgcaaagagctccaacaaaacaattt agaactttattaaggaatagggggaagctaggaagaa actcaaaacatcaagattttaaatacgcttcttggtc tccttgctataattatctgggataagcatgctgtttt ctgtctgtccctaacatgccctgtgattatccgcaaa caacacacccaagggcagaactttgttacttaaacac catcctgtttgcttctttcctcagGAACTGTGGCTGC ACCATCTGTCTTCATCTTCCCGCCATCTGATGAGCAG TTGAAATCTGGAACTGCCTCTGTTGTGTGCCTGCTGA ATAACTTCTATCCCAGAGAGGCCAAAGTACAGTGGAA GGTGGATAACGCCCTCCAATCGGGTAACTCCCAGGAG AGTGTCACAGAGCAGGACAGCAAGGACAGCACCTACA GCCTCAGCAGCACCCTGACGCTGAGCAAAGCAGACTA CGAGAAACACAAAGTCTACGCCTGCGAAGTCACCCAT CAGGGCCTGAGCTCGCCCGTCACAAAGAGCTTCAACA GGGGAGAGTGT

TABLE H Exemplary CD137 binding domains and  bispecific polypeptides for CD137 and CTLA-4 SEQ ID NO. CHAIN NO. TYPE SEQUENCE 177 1205, light  aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK chain VL PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL QPEDFATYYCQQSVPHYPFTFGQGTKLEIK 178 1205, light  nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA chain VL TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGTCT GTTCCGCACTACCCGTTCACTTTTGGCCAGGGGACCAAG CTGGAGATCAAA 179 1204, heavy aa EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYYMGWVRQ chain VH APGKGLEWVSGIGSYYGYTGYADSVKGRFTISRDNSKNT LYLQMNSLRAEDTAVYYCARAYYDYNYYYAYFDYWGQGT LVTVSS 180 1204, heavy nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGTACAG chain VH CCTGGGGGGTCCCTGCGCCTCTCCTGTGCAGCCAGCGGA TTCACCTTTTCTTCTTACTACATGGGTTGGGTCCGCCAG GCTCCAGGGAAGGGGCTGGAGTGGGTCTCAGGTATTGGT TCTTACTACGGTTACACAGGTTATGCAGACTCCGTGAAG GGCCGGTTCACCATCTCCCGTGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGCGTGCCGAGGACACG GCTGTATATTATTGTGCGCGCGCTTACTACGACTACAAC TACTACTACGCTTACTTTGACTATTGGGGCCAGGGAACC CTGGTCACCGTCTCCTCA 181 1214 (VH) aa EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSWVRQ APGKGLEWVSSIGSGGGYTGYADSVKGRFTISRDNSKNT LYLQMNSLRAEDTAVYYCARVGHPFDYWGQGTLVTVSS 182 1214 (VH) nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGTACAG CCTGGGGGGTCCCTGCGCCTCTCCTGTGCAGCCAGCGGA TTCACCTTTAGCAGCTATGCCATGAGCTGGGTCCGCCAG GCTCCAGGGAAGGGGCTGGAGTGGGTCTCATCTATTGGT TCTGGTGGTGGTTACACAGGTTATGCAGACTCCGTGAAG GGCCGGTTCACCATCTCCCGTGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGCGTGCCGAGGACACG GCTGTATATTATTGTGCGCGCGTTGGTCATCCGTTTGAC TATTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA 183 1215 (VL) aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL QPEDFATYYCQQDAYPHTFGQGTKLEIK 184 1215 (VL) nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGGAC GCTTACCCGCACACTTTTGGCCAGGGGACCAAGCTGGAG ATCAAA 185 1618 (VH) aa EVQLLESGGGLVQPGGSLRLSCAASGFTFSYGSMYWVRQ APGKGLEWVSSISSGSGSTYYADSVKGRFTISRDNSKNT LYLQMNSLRAEDTAVYYCARSSYYGSYYSIDYWGQGTLV TVSS 186 1618 (VH) nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGTACAG CCTGGGGGGTCCCTGCGCCTCTCCTGTGCAGCCAGCGGA TTCACCTTTTCTTACGGTTCTATGTACTGGGTCCGCCAG GCTCCAGGGAAGGGGCTGGAGTGGGTCTCATCTATTTCT TCTGGTTCTGGTTCTACATACTATGCAGACTCCGTGAAG GGCCGGTTCACCATCTCCCGTGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGCGTGCCGAGGACACG GCTGTATATTATTGTGCGCGCTCTTCTTACTACGGTTCT TACTACTCTATTGACTATTGGGGCCAGGGAACCCTGGTC ACCGTCTCCTCA 187 1619 (VL) aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL QPEDFATYYCQQYYDNLPTFGQGTKLEIK 188 1619 (VL) nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGTAC TACGACAACCTGCCCACTTTTGGCCAGGGGACCAAGCTG GAGATCAAA 189 1620 (VH) aa EVQLLESGGGLVQPGGSLRLSCAASGFTFSGYYMYWVRQ APGKGLEWVSGISSSGSYTYYADSVKGRFTISRDNSKNT LYLQMNSLRAEDTAVYYCARSVGPYFDYWGQGTLVTVSS 190 1620 (VH) nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGTACAG CCTGGGGGGTCCCTGCGCCTCTCCTGTGCAGCCAGCGGA TTCACCTTTTCTGGTTACTACATGTACTGGGTCCGCCAG GCTCCAGGGAAGGGGCTGGAGTGGGTCTCAGGTATTTCT TCTTCTGGTTCTTACACATACTATGCAGACTCCGTGAAG GGCCGGTTCACCATCTCCCGTGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGCGTGCCGAGGACACG GCTGTATATTATTGTGCGCGCTCTGTTGGTCCGTACTTT GACTATTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA 191 1621 (VL) aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL QPEDFATYYCQQGVGPYTFGQGTKLEIK 192 1621 (VL) nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGGGT GTTGGTCCGTACACTTTTGGCCAGGGGACCAAGCTGGAG ATCAAA 193 1626 (VH) aa EVQLLESGGGLVQPGGSLRLSCAASGFTFGGYSMYWVRQ APGKGLEWVSSIGGYYYSTYYADSVKGRFTISRDNSKNT LYLQMNSLRAEDTAVYYCARSYYGSIDYWGQGTLVTVSS 194 1626 (VH) nt GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGTACAG CCTGGGGGGTCCCTGCGCCTCTCCTGTGCAGCCAGCGGA TTCACCTTTGGTGGTTACTCTATGTACTGGGTCCGCCAG GCTCCAGGGAAGGGGCTGGAGTGGGTCTCATCTATTGGT GGTTACTACTACTCTACATACTATGCAGACTCCGTGAAG GGCCGGTTCACCATCTCCCGTGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGCGTGCCGAGGACACG GCTGTATATTATTGTGCGCGCTCTTACTACGGTTCTATT GACTATTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA 195 1627 (VL) aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL QPEDFATYYCQQGTGYGPLTFGQGTKLEIK 196 1627 (VL) nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGGGT ACTGGTTACGGTCCGCTCACTTTTGGCCAGGGGACCAAG CTGGAGATCAAA 197 1761 = 1205 nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA Light chain TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT VL, with CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA constant  CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC kappa  AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT sequence,  GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG linker and CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGTCT CD86 mutant GTTCCGCACTACCCGTTCACTTTTGGCCAGGGGACCAAG 1040  CTGGAGATCAAACGTgagtcgtacgctagcaagcttgat inclusive  atcgaattctaaactctgagggggtcggatgacgtggcc intron attctttgcctaaagcattgagtttactgcaaggtcaga sequence aaagcatgcaaagccctcagaatggctgcaaagagctcc aacaaaacaatttagaactttattaaggaatagggggaa gctaggaagaaactcaaaacatcaagattttaaatacgc ttcttggtctccttgctataattatctgggataagcatg ctgttttctgtctgtccctaacatgccctgtgattatcc gcaaacaacacacccaagggcagaactttgttacttaaa caccatcctgtttgcttctttcctcagGAACTGTGGCTG CACCATCTGTCTTCATCTTCCCGCCATCTGATGAGCAGT TGAAATCTGGAACTGCCTCTGTTGTGTGCCTGCTGAATA ACTTCTATCCCAGAGAGGCCAAAGTACAGTGGAAGGTGG ATAACGCCCTCCAATCGGGTAACTCCCAGGAGAGTGTCA CAGAGCAGGACAGCAAGGACAGCACCTACAGCCTCAGCA GCACCCTGACGCTGAGCAAAGCAGACTACGAGAAACACA AAGTCTACGCCTGCGAAGTCACCCATCAGGGCCTGAGCT CGCCCGTCACAAAGAGCTTCAACAGGGGAGAGTGTAGCG GAGGAGGAGGAAGCGGAGGAGGAGGAAGCGCCCCCCTCA AAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGT GTCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAAC TGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGA ACGAAGTCTATCTGGGCAAAGAGCGGTTCGACAGCGTGG ACAGCAAGTATATGGGCCGCACCAGCTTTGATAGCGACA GCTGGACCCTGCGTCTGCACAATCTGCAAATCAAAGATA AGGGTAGGTACCAGTGCATTATCCACCATAAGAAGCCGA CGGGTATGATTAATATTCACCAAATGAACTCCGAGTTGT CTGTCCTGGCG 198 1761 = 1205 aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK light chain  PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL VL, with  QPEDFATYYCQQSVPHYPFTFGQGTKLEIKRTVAAPSVF constant IFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQ kappa SGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYAC sequence,  EVTHQGLSSPVTKSFNRGECSGGGGSGGGGSAPLKIQAY linker FNETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVYL (underlined)  GKERFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGRYQ and CD86  CIIHHKKPTGMINIHQMNSELSVLA mutant 1040 LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING THE 1204 VH  SEQUENCE THUS, COMPLETE MOLECULE MAY BE  DESIGNATED 1204/1761 199 1763 = 1215 nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA Light chain  TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT VL, with  CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA constant CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC kappa AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT sequence,  GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG linker CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGGAC and CD86 GCTTACCCGCACACTTTTGGCCAGGGGACCAAGCTGGAG mutant 1040 ATCAAACGTgagtcgtacgctagcaagcttgatatcgaa ttctaaactctgagggggtcggatgacgtggccattctt tgcctaaagcattgagtttactgcaaggtcagaaaagca tgcaaagccctcagaatggctgcaaagagctccaacaaa acaatttagaactttattaaggaatagggggaagctagg aagaaactcaaaacatcaagattttaaatacgcttcttg gtctccttgctataattatctgggataagcatgctgttt tctgtctgtccctaacatgccctgtgattatccgcaaac aacacacccaagggcagaactttgttacttaaacaccat cctgtttgcttctttcctcagGAACTGTGGCTGCACCAT CTGTCTTCATCTTCCCGCCATCTGATGAGCAGTTGAAAT CTGGAACTGCCTCTGTTGTGTGCCTGCTGAATAACTTCT ATCCCAGAGAGGCCAAAGTACAGTGGAAGGTGGATAACG CCCTCCAATCGGGTAACTCCCAGGAGAGTGTCACAGAGC AGGACAGCAAGGACAGCACCTACAGCCTCAGCAGCACCC TGACGCTGAGCAAAGCAGACTACGAGAAACACAAAGTCT ACGCCTGCGAAGTCACCCATCAGGGCCTGAGCTCGCCCG TCACAAAGAGCTTCAACAGGGGAGAGTGTAGCGGAGGAG GAGGAAGCGGAGGAGGAGGAAGCGCCCCCCTCAAAATCC AAGCGTACTTCAACGAAACTGCAGACTTACCGTGTCAGT TTGCCAATTCGCAGAATCTGAGCCTGAGCGAACTGGTGG TTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACGAAG TCTATCTGGGCAAAGAGCGGTTCGACAGCGTGGACAGCA AGTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGA CCCTGCGTCTGCACAATCTGCAAATCAAAGATAAGGGTA GGTACCAGTGCATTATCCACCATAAGAAGCCGACGGGTA TGATTAATATTCACCAAATGAACTCCGAGTTGTCTGTCC TGGCG 200 1763 = 1215 aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK Light chain  PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL VL, with  QPEDFATYYCQQDAYPHTFGQGTKLEIKRTVAAPSVFIF constant PPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSG kappa NSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEV sequence,  THQGLSSPVTKSFNRGECSGGGGSGGGGSAPLKIQAYFN linker ETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVYLGK (underlined)  ERFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGRYQCI and CD86  IHHKKPTGMINIHQMNSELSVLA mutant 1040 LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING THE 1214 VH  SEQUENCE THUS, COMPLETE MOLECULE MAY BE  DESIGNATED 1214/1763 201 1765 = 1619 nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA Light chain  TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT VL, with  CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA constant CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC kappa AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT sequence,  GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG linker CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGTAC and CD86 TACGACAACCTGCCCACTTTTGGCCAGGGGACCAAGCTG mutant 1040 GAGATCAAACGTgagtcgtacgctagcaagcttgatatc gaattctaaactctgagggggtcggatgacgtggccatt ctttgcctaaagcattgagtttactgcaaggtcagaaaa gcatgcaaagccctcagaatggctgcaaagagctccaac aaaacaatttagaactttattaaggaatagggggaagct aggaagaaactcaaaacatcaagattttaaatacgcttc ttggtctccttgctataattatctgggataagcatgctg ttttctgtctgtccctaacatgccctgtgattatccgca aacaacacacccaagggcagaactttgttacttaaacac catcctgtttgcttctttcctcagGAACTGTGGCTGCAC CATCTGTCTTCATCTTCCCGCCATCTGATGAGCAGTTGA AATCTGGAACTGCCTCTGTTGTGTGCCTGCTGAATAACT TCTATCCCAGAGAGGCCAAAGTACAGTGGAAGGTGGATA ACGCCCTCCAATCGGGTAACTCCCAGGAGAGTGTCACAG AGCAGGACAGCAAGGACAGCACCTACAGCCTCAGCAGCA CCCTGACGCTGAGCAAAGCAGACTACGAGAAACACAAAG TCTACGCCTGCGAAGTCACCCATCAGGGCCTGAGCTCGC CCGTCACAAAGAGCTTCAACAGGGGAGAGTGTAGCGGAG GAGGAGGAAGCGGAGGAGGAGGAAGCGCCCCCCTCAAAA TCCAAGCGTACTTCAACGAAACTGCAGACTTACCGTGTC AGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAACTGG TGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACG AAGTCTATCTGGGCAAAGAGCGGTTCGACAGCGTGGACA GCAAGTATATGGGCCGCACCAGCTTTGATAGCGACAGCT GGACCCTGCGTCTGCACAATCTGCAAATCAAAGATAAGG GTAGGTACCAGTGCATTATCCACCATAAGAAGCCGACGG GTATGATTAATATTCACCAAATGAACTCCGAGTTGTCTG TCCTGGCG 202 1765 = 1619 aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK Light chain  PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL VL, with  QPEDFATYYCQQYYDNLPTFGQGTKLEIKRTVAAPSVFI constant FPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQS kappa GNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACE sequence,  VTHQGLSSPVTKSFNRGECSGGGGSGGGGSAPLKIQAYF linker NETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVYLG (underlined)  KERFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGRYQC and CD86  IIHHKKPTGMINIHQMNSELSVLA mutant 1040 LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING THE 1618 VH  SEQUENCE THUS, COMPLETE MOLECULE MAY BE  DESIGNATED 1618/1765 203 1767 = 1621 nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA Light chain  TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT VL, with  CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA constant CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC kappa AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT sequence,  GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG linker CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGGGT and CD86 GTTGGTCCGTACACTTTTGGCCAGGGGACCAAGCTGGAG mutant 1040 ATCAAACGTgagtcgtacgctagcaagcttgatatcgaa ttctaaactctgagggggtcggatgacgtggccattctt tgcctaaagcattgagtttactgcaaggtcagaaaagca tgcaaagccctcagaatggctgcaaagagctccaacaaa acaatttagaactttattaaggaatagggggaagctagg aagaaactcaaaacatcaagattttaaatacgcttcttg gtctccttgctataattatctgggataagcatgctgttt tctgtctgtccctaacatgccctgtgattatccgcaaac aacacacccaagggcagaactttgttacttaaacaccat cctgtttgcttctttcctcagGAACTGTGGCTGCACCAT CTGTCTTCATCTTCCCGCCATCTGATGAGCAGTTGAAAT CTGGAACTGCCTCTGTTGTGTGCCTGCTGAATAACTTCT ATCCCAGAGAGGCCAAAGTACAGTGGAAGGTGGATAACG CCCTCCAATCGGGTAACTCCCAGGAGAGTGTCACAGAGC AGGACAGCAAGGACAGCACCTACAGCCTCAGCAGCACCC TGACGCTGAGCAAAGCAGACTACGAGAAACACAAAGTCT ACGCCTGCGAAGTCACCCATCAGGGCCTGAGCTCGCCCG TCACAAAGAGCTTCAACAGGGGAGAGTGTAGCGGAGGAG GAGGAAGCGGAGGAGGAGGAAGCGCCCCCCTCAAAATCC AAGCGTACTTCAACGAAACTGCAGACTTACCGTGTCAGT TTGCCAATTCGCAGAATCTGAGCCTGAGCGAACTGGTGG TTTTCTGGCAGGATCAGGAGAACCTGGTTCTGAACGAAG TCTATCTGGGCAAAGAGCGGTTCGACAGCGTGGACAGCA AGTATATGGGCCGCACCAGCTTTGATAGCGACAGCTGGA CCCTGCGTCTGCACAATCTGCAAATCAAAGATAAGGGTA GGTACCAGTGCATTATCCACCATAAGAAGCCGACGGGTA TGATTAATATTCACCAAATGAACTCCGAGTTGTCTGTCC TGGCG 204 1767 = 1621 aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK Light chain  PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL VL, with  QPEDFATYYCQQGVGPYTFGQGTKLEIKRTVAAPSVFIF constant PPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSG kappa NSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEV sequence,  THQGLSSPVTKSFNRGECSGGGGSGGGGSAPLKIQAYFN linker ETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVYLGK (underlined)  ERFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGRYQCI and CD86  IHHKKPTGMINIHQMNSELSVLA mutant 1040 LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING THE 1620 VH  SEQUENCE THUS, COMPLETE MOLECULE MAY BE  DESIGNATED 1620/1767 205 1769 = 1627 nt GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGCGCA Light chain  TCTGTAGGAGACCGCGTCACCATCACTTGCCGGGCAAGT VL, with  CAGAGCATTAGCAGCTATTTAAATTGGTATCAGCAGAAA constant CCAGGGAAAGCCCCTAAGCTCCTGATCTATGCTGCATCC kappa AGTTTGCAAAGTGGGGTCCCATCACGTTTCAGTGGCAGT sequence,  GGAAGCGGGACAGATTTCACTCTCACCATCAGCAGTCTG linker CAACCTGAAGATTTTGCAACTTATTACTGTCAACAGGGT (underlined)  ACTGGTTACGGTCCGCTCACTTTTGGCCAGGGGACCAAG and CD86  CTGGAGATCAAACGTgagtcgtacgctagcaagcttgat mutant 1040 atcgaattctaaactctgagggggtcggatgacgtggcc attctttgcctaaagcattgagtttactgcaaggtcaga aaagcatgcaaagccctcagaatggctgcaaagagctcc aacaaaacaatttagaactttattaaggaatagggggaa gctaggaagaaactcaaaacatcaagattttaaatacgc ttcttggtctccttgctataattatctgggataagcatg ctgttttctgtctgtccctaacatgccctgtgattatcc gcaaacaacacacccaagggcagaactttgttacttaaa caccatcctgtttgcttctttcctcagGAACTGTGGCTG CACCATCTGTCTTCATCTTCCCGCCATCTGATGAGCAGT TGAAATCTGGAACTGCCTCTGTTGTGTGCCTGCTGAATA ACTTCTATCCCAGAGAGGCCAAAGTACAGTGGAAGGTGG ATAACGCCCTCCAATCGGGTAACTCCCAGGAGAGTGTCA CAGAGCAGGACAGCAAGGACAGCACCTACAGCCTCAGCA GCACCCTGACGCTGAGCAAAGCAGACTACGAGAAACACA AAGTCTACGCCTGCGAAGTCACCCATCAGGGCCTGAGCT CGCCCGTCACAAAGAGCTTCAACAGGGGAGAGTGTAGCG GAGGAGGAGGAAGCGGAGGAGGAGGAAGCGCCCCCCTCA AAATCCAAGCGTACTTCAACGAAACTGCAGACTTACCGT GTCAGTTTGCCAATTCGCAGAATCTGAGCCTGAGCGAAC TGGTGGTTTTCTGGCAGGATCAGGAGAACCTGGTTCTGA ACGAAGTCTATCTGGGCAAAGAGCGGTTCGACAGCGTGG ACAGCAAGTATATGGGCCGCACCAGCTTTGATAGCGACA GCTGGACCCTGCGTCTGCACAATCTGCAAATCAAAGATA AGGGTAGGTACCAGTGCATTATCCACCATAAGAAGCCGA CGGGTATGATTAATATTCACCAAATGAACTCCGAGTTGT CTGTCCTGGCG 206 1769 = 1627 aa DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWYQQK Light chain  PGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFTLTISSL VL, with  QPEDFATYYCQQGTGYGPLTFGQGTKLEIKRTVAAPSVF constant IFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQ kappa SGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYAC sequence,  EVTHQGLSSPVTKSFNRGECSGGGGSGGGGSAPLKIQAY linker FNETADLPCQFANSQNLSLSELVVFWQDQENLVLNEVYL (underlined)  GKERFDSVDSKYMGRTSFDSDSWTLRLHNLQIKDKGRYQ and CD86  CIIHHKKPTGMINIHQMNSELSVLA mutant 1040 LIGHT CHAIN PREFERABLY ASSEMBLES WITH A HEAVY CHAIN COMPRISING THE 1626 VH  SEQUENCE THUS, COMPLETE MOLECULE MAY BE  DESIGNATED 1626/1769

TABLE I(1) Exemplary CD137 CDR sequences Antibody CDRH1 CDRH2 CDRH3 1204/1205 GFTFSSYY IGSYYGYT ARAYYDYNYYYAYFDY (SEQ ID NO: 207) (SEQ ID NO: 212) (SEQ ID NO: 217) 1214/1215 GFTFSSYA IGSGGGYT ARVGHPFDY (SEQ ID NO: 208) (SEQ ID NO: 213) (SEQ ID NO: 218) 1618/1619 GFTFSYGS ISSGSGST ARSSYYGSYYSIDY (SEQ ID NO: 209) (SEQ ID NO: 214) (SEQ ID NO: 219) 1620/1621 GFTFSGYY ISSSGSYT ARSVGPYFDY (SEQ ID NO: 210) (SEQ ID NO: 215) (SEQ ID NO: 220) 1626/1627 GFTFGGYS IGGYYYST ARSYYGSIDY (SEQ ID NO: 211) (SEQ ID NO: 216) (SEQ ID NO: 221)

TABLE I(2) Exemplary CD137 CDR sequences Antibody CDRL1 CDRL2 CDRL3 1204/1205 QSISSY AAS QQSVPHYPFT (SEQ ID NO: 80) (SEQ ID NO: 81) (SEQ ID NO: 222) 1214/1215 QSISSY AAS QQDAYPHT (SEQ ID NO: 80) (SEQ ID NO: 81) (SEQ ID NO: 223) 1618/1619 QSISSY AAS QQYYDNLPT (SEQ ID NO: 80) (SEQ ID NO: 81) (SEQ ID NO: 224) 1620/1621 QSISSY AAS QQGVGPYT (SEQ ID NO: 80) (SEQ ID NO: 81) (SEQ ID NO: 225) 1626/1627 QSISSY AAS QQGTGYGPLT (SEQ ID NO: 80) (SEQ ID NO: 81) (SEQ ID NO: 226)

Other Sequences

(human CTLA-4) SEQ ID NO: 1 MHVAQPAVVLASSRGIASFVCEYASPGKATEVRVTVLRQADSQVTEVCAA TYMMGNELTFLDDSICTGTSSGNQVNLTIQGLRAMDTGLYICKVELMYPP PYYLGIGNGTQIYVIAKEKKPSYNRGLCENAPNRARM (human CD28) SEQ ID NO: 2 MLRLLLALNLFPSIQVTGNKILVKQSPMLVAYDNAVNLSCKYSYNLFSRE FRASLHKGLDSAVEVCVVYGNYSQQLQVYSKTGFNCDGKLGNESVTFYLQ NLYVNQTDIYFCKIEVMYPPPYLDNEKSNGTIIHVKGKHLCPSPLFPGPS KPFWVLVVVGGVLACYSLLVTVAFIIFWVRSKRSRLLHSDYMNMTPRRPG PTRKHYQPYAPPRDFAAYRS SEQ ID NO: 3 APLKIQAYFNETADLPCQFANSQNQSLSELVVFWQDQENLVLNEVYLGKE KFDSVHSKYMGRTSFDSDSWTLRLHNLQIKDKGLYQCIIHHKKPTGMIRI HQMNSELSVLA SEQ ID NO: 4 MDPQCTMGLSNILFVMAFLLSGAAPLKIQAYFNETADLPCQFANSQNQSL SELVVFWQDQENLVLNEVYLGKEKFDSVHSKYMGRTSFDSDSWTLRLHNL QIKDKGLYQCIIHHKKPTGMIRIHQMNSELSVLANFSQPEIVPISNITEN VYINLTCSSIHGYPEPKKMSVLLRTKNSTIEYDGIMQKSQDNVTELYDVS ISLSVSFPDVTSNMTIFCILETDKTRLLSSPFSIELEDPQPPPDHIP SEQ ID NO: 5 APLKIQAYFNETADLPCQFANSQNQSLSELVVFWQDQENLVLNEVYLGKE KFDSVASKYMGRTSFDSDSWTLRLHNLQIKDKGLYQCIIHHKKPTGMIRI HQMNSELSVLA (human CD86) SEQ ID NO: 44 MDPQCTMGLSNILFVMAFLLSGAAPLKIQAYFNETADLPCQFANSQNQSL SELVVFWQDQENLVLNEVYLGKEKFDSVHSKYMGRTSFDSDSWTLRLHNL QIKDKGLYQCIIHHKKPTGMIRIHQMNSELSVLANFSQPEIVPISNITEN VYINLTCSSIHGYPEPKKMSVLLRTKNSTIEYDGIMQKSQDNVTELYDVS ISLSVSFPDVTSNMTIFCILETDKTRLLSSPFSIELEDPQPPPDHIPWIT AVLPTVIICVMVFCLILWKWKKKKRPRNSYKCGTNTMEREESEQTKKREK IHIPERSDEAQRVFKSSKTSSCDKSDTCF (murine CTLA-4) SEQ ID NO: 45 MACLGLRRYKAQLQLPSRTWPFVALLTLLFIPVFSEAIQVTQPSVVLASS HGVASFPCEYSPSHNTDEVRVTVLRQTNDQMTEVCATTFTEKNTVGFLDY PFCSGTFNESRVNLTIQGLRAVDTGLYLCKVELMYPPPYFVGMGNGTQIY VIDPEPCPDSDFLLWILVAVSLGLFFYSFLVSAVSLSKMLKKRSPLTTGV YVKMPPTEPECEKQFQPYFIPIN (murine CD28) SEQ ID NO: 46 MTLRLLFLALNFFSVQVTENKILVKQSPLLVVDSNEVSLSCRYSYNLLAK EFRASLYKGVNSDVEVCVGNGNFTYQPQFRSNAEFNCDGDFDNETVTFRL WNLHVNHTDIYFCKIEFMYPPPYLDNERSNGTIIHIKEKHLCHTQSSPKL FWALVVVAGVLFCYGLLVTVALCVIWTNSRRNRLLQVTTMNMTPRRPGLT RKPYQPYAPARDFAAYRP (human OX40) SEQ ID NO: 51 MCVGARRLGRGPCAALLLLGLGLSTVTGLHCVGDTYPSNDRCCHECRPGN GMVSRCSRSQNTVCRPCGPGFYNDVVSSKPCKPCTMCNLRSGSERKQLCT ATQDTVCRCRAGTQPLDSYKPGVDCAPCPPGHFSPGDNQACKPWTNCTLA GKHTLQPASNSSDAICEDRDPPATQPQETQGPPARPITVQPTEAWPRTSQ GPSTRPVEVPGGRAVAAILGLGLVLGLLGPLAILLALYLLRRDQRLPPDA HKPPGGGSFRTPIQEEQADAHSTLAKI SEQ ID NO: 140 gcttccacca agggcccatc cgtcttcccc ctggcgccct gctccaggag cacctccgag agcacagccg ccctgggctg cctggtcaag gactacttcc ccgaaccggt gacggtgtcg tggaactcag gcgccctgac cagcggcgtg cacaccttcc cggctgtcct acagtcctca ggactctact ccctcagcag cgtggtgacc gtgccctcca gcagcttggg cacgaagacc tacacctgca acgtagatca caagcccagc aacaccaagg tggacaagag agttgagtcc aaatatggtc ccccatgccc accttgccca gcacctgagt tcctgggggg accatcagtc ttcctgttcc ccccaaaacc caaggacact ctcatgatct cccggacccc tgaggtcacg tgcgtggtgg tggacgtgag ccaggaagac cccgaggtcc agttcaactg gtacgtggat ggcgtggagg tgcataatgc caagacaaag ccgcgggagg agcagttcaa cagcacgtac cgtgtggtca gcgtcctcac cgtcctgcac caggactggc tgaacggcaa ggagtacaag tgcaaggtct ccaacaaagg cctcccgtcc tccatcgaga aaaccatctc caaagccaaa gggcagcccc gagagccaca ggtgtacacc ctgcccccat cccaggagga gatgaccaag aaccaggtca gcctgacctg cctggtcaaa ggcttctacc ccagcgacat cgccgtggag tgggagagca atgggcagcc ggagaacaac tacaagacca cgcctcccgt gctggactcc gacggctcct tcttcctcta cagcaggcta accgtggaca agagcaggtg gcaggagggg aatgtcttct catgctccgt gatgcatgag gctctgcaca accgctacac acagaagagc ctctccctgt ctctgggtaa a SEQ ID NO: 141 agctttctgg ggcaggccgg gcctgacttt ggctgggggc agggaggggg ctaaggtgac gcaggtggcg ccagccaggt gcacacccaa tgcccatgag cccagacact ggaccctgca tggaccatcg cggatagaca agaaccgagg ggcctctgcg ccctgggccc agctctgtcc cacaccgcgg tcacatggca ccacctctct tgcagcttcc accaagggcc catccgtctt ccccctggcg ccctgctcca ggagcacctc cgagagcaca gccgccctgg gctgcctggt caaggactac ttccccgaac cggtgacggt gtcgtggaac tcaggcgccc tgaccagcgg cgtgcacacc ttcccggctg tcctacagtc ctcaggactc tactccctca gcagcgtggt gaccgtgccc tccagcagct tgggcacgaa gacctacacc tgcaacgtag atcacaagcc cagcaacacc aaggtggaca agagagttgg tgagaggcca gcacagggag ggagggtgtc tgctggaagc caggctcagc cctcctgcct ggacgcaccc cggctgtgca gccccagccc agggcagcaa ggcatgcccc atctgtctcc tcacccggag gcctctgacc accccactca tgctcaggga gagggtcttc tggatttttc caccaggctc ccggcaccac aggctggatg cccctacccc aggccctgcg catacagggc aggtgctgcg ctcagacctg ccaagagcca tatccgggag gaccctgccc ctgacctaag cccaccccaa aggccaaact ctccactccc tcagctcaga caccttctct cctcccagat ctgagtaact cccaatcttc tctctgcaga gtccaaatat ggtcccccat gcccaccttg cccaggtaag ccaacccagg cctcgccctc cagctcaagg cgggacaggt gccctagagt agcctgcatc cagggacagg ccccagccgg gtgctgacgc atccacctcc atctcttcct cagcacctga gttcctgggg ggaccatcag tcttcctgtt ccccccaaaa cccaaggaca ctctcatgat ctcccggacc cctgaggtca cgtgcgtggt ggtggacgtg agccaggaag accccgaggt ccagttcaac tggtacgtgg atggcgtgga ggtgcataat gccaagacaa agccgcggga ggagcagttc aacagcacgt accgtgtggt cagcgtcctc accgtcctgc accaggactg gctgaacggc aaggagtaca agtgcaaggt ctccaacaaa ggcctcccgt cctccatcga gaaaaccatc tccaaagcca aaggtgggac ccacggggtg cgagggccac acggacagag gccagctcgg cccaccctct gccctgggag tgaccgctgt gccaacctct gtccctacag ggcagccccg agagccacag gtgtacaccc tgcccccatc ccaggaggag atgaccaaga accaggtcag cctgacctgc ctggtcaaag gcttctaccc cagcgacatc gccgtggagt gggagagcaa tgggcagccg gagaacaact acaagaccac gcctcccgtg ctggactccg acggctcctt cttcctctac agcaggctaa ccgtggacaa gagcaggtgg caggagggga atgtcttctc atgctccgtg atgcatgagg ctctgcacaa ccgctacaca cagaagagcc tctccctgtc tctgggtaaa tgagtgccag ggccggcaag cccccgctcc ccgggctctc ggggtcgcgc gaggatgctt ggcacgtacc ccgtctacat acttcccagg cacccagcat ggaaataaag cacccaccac tgccctgggc ccctgtgaga ctgtgatggt tctttccacg ggtcaggccg agtctgaggc ctgagtgaca tgagggaggc agagcgggtc ccactgtccc cacactgg SEQ ID NO: 142 gcttccacca agggcccatc cgtcttcccc ctggcgccct gctccaggag cacctccgag agcacagccg ccctgggctg cctggtcaag gactacttcc ccgaaccggt gacggtgtcg tggaactcag gcgccctgac cagcggcgtg cacaccttcc cggctgtcct acagtcctca ggactctact ccctcagcag cgtggtgacc gtgccctcca gcagcttggg cacgaagacc tacacctgca acgtagatca caagcccagc aacaccaagg tggacaagag agttgagtcc aaatatggtc ccccatgccc atcatgccca gcacctgagt tcctgggggg accatcagtc ttcctgttcc ccccaaaacc caaggacact ctcatgatct cccggacccc tgaggtcacg tgcgtggtgg tggacgtgag ccaggaagac cccgaggtcc agttcaactg gtacgtggat ggcgtggagg tgcataatgc caagacaaag ccgcgggagg agcagttcaa cagcacgtac cgtgtggtca gcgtcctcac cgtcctgcac caggactggc tgaacggcaa ggagtacaag tgcaaggtct ccaacaaagg cctcccgtcc tccatcgaga aaaccatctc caaagccaaa gggcagcccc gagagccaca ggtgtacacc ctgcccccat cccaggagga gatgaccaag aaccaggtca gcctgacctg cctggtcaaa ggcttctacc ccagcgacat cgccgtggag tgggagagca atgggcagcc ggagaacaac tacaagacca cgcctcccgt gctggactcc gacggctcct tcttcctcta cagcaggcta accgtggaca agagcaggtg gcaggagggg aatgtcttct catgctccgt gatgcatgag gctctgcaca accactacac acagaagagc ctctccctgt ctctgggtaa a SEQ ID NO: 143 agctttctgg ggcaggccgg gcctgacttt ggctgggggc agggaggggg ctaaggtgac gcaggtggcg ccagccaggt gcacacccaa tgcccatgag cccagacact ggaccctgca tggaccatcg cggatagaca agaaccgagg ggcctctgcg ccctgggccc agctctgtcc cacaccgcgg tcacatggca ccacctctct tgcagcttcc accaagggcc catccgtctt ccccctggcg ccctgctcca ggagcacctc cgagagcaca gccgccctgg gctgcctggt caaggactac ttccccgaac cggtgacggt gtcgtggaac tcaggcgccc tgaccagcgg cgtgcacacc ttcccggctg tcctacagtc ctcaggactc tactccctca gcagcgtggt gaccgtgccc tccagcagct tgggcacgaa gacctacacc tgcaacgtag atcacaagcc cagcaacacc aaggtggaca agagagttgg tgagaggcca gcacagggag ggagggtgtc tgctggaagc caggctcagc cctcctgcct ggacgcaccc cggctgtgca gccccagccc agggcagcaa ggcatgcccc atctgtctcc tcacccggag gcctctgacc accccactca tgctcaggga gagggtcttc tggatttttc caccaggctc ccggcaccac aggctggatg cccctacccc aggccctgcg catacagggc aggtgctgcg ctcagacctg ccaagagcca tatccgggag gaccctgccc ctgacctaag cccaccccaa aggccaaact ctccactccc tcagctcaga caccttctct cctcccagat ctgagtaact cccaatcttc tctctgcaga gtccaaatat ggtcccccat gcccatcatg cccaggtaag ccaacccagg cctcgccctc cagctcaagg cgggacaggt gccctagagt agcctgcatc cagggacagg ccccagccgg gtgctgacgc atccacctcc atctcttcct cagcacctga gttcctgggg ggaccatcag tcttcctgtt ccccccaaaa cccaaggaca ctctcatgat ctcccggacc cctgaggtca cgtgcgtggt ggtggacgtg agccaggaag accccgaggt ccagttcaac tggtacgtgg atggcgtgga ggtgcataat gccaagacaa agccgcggga ggagcagttc aacagcacgt accgtgtggt cagcgtcctc accgtcctgc accaggactg gctgaacggc aaggagtaca agtgcaaggt ctccaacaaa ggcctcccgt cctccatcga gaaaaccatc tccaaagcca aaggtgggac ccacggggtg cgagggccac acggacagag gccagctcgg cccaccctct gccctgggag tgaccgctgt gccaacctct gtccctacag ggcagccccg agagccacag gtgtacaccc tgcccccatc ccaggaggag atgaccaaga accaggtcag cctgacctgc ctggtcaaag gcttctaccc cagcgacatc gccgtggagt gggagagcaa tgggcagccg gagaacaact acaagaccac gcctcccgtg ctggactccg acggctcctt cttcctctac agcaggctaa ccgtggacaa gagcaggtgg caggagggga atgtcttctc atgctccgtg atgcatgagg ctctgcacaa ccactacaca cagaagagcc tctccctgtc tctgggtaaa tgagtgccag ggccggcaag cccccgctcc ccgggctctc ggggtcgcgc gaggatgctt ggcacgtacc ccgtctacat acttcccagg cacccagcat ggaaataaag cacccaccac tgccctgggc ccctgtgaga ctgtgatggt tctttccacg ggtcaggccg agtctgaggc ctgagtgaca tgagggaggc agagcgggtc ccactgtccc cacactgg SEQ ID NO: 145 gcctccacca agggcccatc ggtcttcccc ctggcaccct cctccaagag cacctctggg ggcacagcgg ccctgggctg cctggtcaag gactacttcc ccgaaccggt gacggtgtcg tggaactcag gcgccctgac cagcggcgtg cacaccttcc cggctgtcct acagtcctca ggactctact ccctcagcag cgtggtgacc gtgccctcca gcagcttggg cacccagacc tacatctgca acgtgaatca caagcccagc aacaccaagg tggacaagaa agttgagccc aaatcttgtg acaaaactca cacatgccca ccgtgcccag cacctgaact cctgggggga ccgtcagtct tcctcttccc cccaaaaccc aaggacaccc tcatgatctc ccggacccct gaggtcacat gcgtggtggt ggacgtgagc cacgaagacc ctgaggtcaa gttcaactgg tacgtggacg gcgtggaggt gcataatgcc aagacaaagc cgcgggagga gcagtacaac agcacgtacc gtgtggtcag cgtcctcacc gtcctgcacc aggactggct gaatggcaag gagtacaagt gcaaggtctc caacaaagcc ctcccagccc ccatcgagaa aaccatctcc aaagccaaag ggcagccccg agaaccacag gtgtacaccc tgcccccatc ccgggatgag ctgaccaaga accaggtcag cctgacctgc ctggtcaaag gcttctatcc cagcgacatc gccgtggagt gggagagcaa tgggcagccg gagaacaact acaagaccac gcctcccgtg ctggactccg acggctcctt cttcctctac agcaagctca ccgtggacaa gagcaggtgg cagcagggga acgtcttctc atgctccgtg atgcatgagg ctctgcacaa ccactacacg cagaagagcc tctccctgtc tccgggtaaa SEQ ID NO: 146 gcctccacca agggcccatc ggtcttcccc ctggcaccct cctccaagag cacctctggg ggcacagcgg ccctgggctg cctggtcaag gactacttcc ccgaaccggt gacggtgtcg tggaactcag gcgccctgac cagcggcgtg cacaccttcc cggctgtcct acagtcctca ggactctact ccctcagcag cgtggtgacc gtgccctcca gcagcttggg cacccagacc tacatctgca acgtgaatca caagcccagc aacaccaagg tggacaagaa agttggtgag aggccagcac agggagggag ggtgtctgct ggaagccagg ctcagcgctc ctgcctggac gcatcccggc tatgcagccc cagtccaggg cagcaaggca ggccccgtct gcctcttcac ccggaggcct ctgcccgccc cactcatgct cagggagagg gtcttctggc tttttcccca ggctctgggc aggcacaggc taggtgcccc taacccaggc cctgcacaca aaggggcagg tgctgggctc agacctgcca agagccatat ccgggaggac cctgcccctg acctaagccc accccaaagg ccaaactctc cactccctca gctcggacac cttctctcct cccagattcc agtaactccc aatcttctct ctgcagagcc caaatcttgt gacaaaactc acacatgccc accgtgccca ggtaagccag cccaggcctc gccctccagc tcaaggcggg acaggtgccc tagagtagcc tgcatccagg gacaggcccc agccgggtgc tgacacgtcc acctccatct cttcctcagc acctgaactc ctggggggac cgtcagtctt cctcttcccc ccaaaaccca aggacaccct catgatctcc cggacccctg aggtcacatg cgtggtggtg gacgtgagcc acgaagaccc tgaggtcaag ttcaactggt acgtggacgg cgtggaggtg cataatgcca agacaaagcc gcgggaggag cagtacaaca gcacgtaccg tgtggtcagc gtcctcaccg tcctgcacca ggactggctg aatggcaagg agtacaagtg caaggtctcc aacaaagccc tcccagcccc catcgagaaa accatctcca aagccaaagg tgggacccgt ggggtgcgag ggccacatgg acagaggccg gctcggccca ccctctgccc tgagagtgac cgctgtacca acctctgtcc ctacagggca gccccgagaa ccacaggtgt acaccctgcc cccatcccgg gatgagctga ccaagaacca ggtcagcctg acctgcctgg tcaaaggctt ctatcccagc gacatcgccg tggagtggga gagcaatggg cagccggaga acaactacaa gaccacgcct cccgtgctgg actccgacgg ctccttcttc ctctacagca agctcaccgt ggacaagagc aggtggcagc aggggaacgt cttctcatgc tccgtgatgc atgaggctct gcacaaccac tacacgcaga agagcctctc cctgtctccg ggtaaa SEQ ID NO: 147 cgaactgtgg ctgcaccatc tgtcttcatc ttcccgccat ctgatgagca gttgaaatct ggaactgcct ctgttgtgtg cctgctgaat aacttctatc ccagagaggc caaagtacag tggaaggtgg ataacgccct ccaatcgggt aactcccagg agagtgtcac agagcaggac agcaaggaca gcacctacag cctcagcagc accctgacgc tgagcaaagc agactacgag aaacacaaag tctacgcctg cgaagtcacc catcagggcc tgagctcgcc cgtcacaaag agcttcaaca ggggagagtg t (Human CD137, amino acid sequence: >gi|571321|gb|AAA53133.1| 4-1BB [Homo sapiens]) SEQ ID NO: 148 MGNSCYNIVATLLLVLNFERTRSLQDPCSNCPAGTFCDNNRNQICSPCPP NSFSSAGGQRTCDICRQCKGVFRTRKECSSTSNAECDCTPGFHCLGAGCS MCEQDCKQGQELTKKGCKDCCFGTFNDQKRGICRPWTNCSLDGKSVLVNG TKERDVVCGPSPADLSPGASSVTPPAPAREPGHSPQIISFFLALTSTALL FLLFFLTLRFSVVKRGRKKLLYIFKQPFMRPVQTTQEEDGCSCRFPEEEE GGCEL SEQ ID NO: 175 gcttccacca agggcccatc cgtcttcccc ctggcgccct gctccaggag cacctccgag agcacagccg ccctgggctg cctggtcaag gactacttcc ccgaaccggt gacggtgtcg tggaactcag gcgccctgac cagcggcgtg cacaccttcc cggctgtcct acagtcctca ggactctact ccctcagcag cgtggtgacc gtgccctcca gcagcttggg cacgaagacc tacacctgca acgtagatca caagcccagc aacaccaagg tggacaagag agttgagtcc aaatatggtc ccccatgccc accttgccca gcacctgagt tcctgggggg accatcagtc ttcctgttcc ccccaaaacc caaggacact ctcatgatct cccggacccc tgaggtcacg tgcgtggtgg tggacgtgag ccaggaagac cccgaggtcc agttcaactg gtacgtggat ggcgtggagg tgcataatgc caagacaaag ccgcgggagg agcagttcaa cagcacgtac cgtgtggtca gcgtcctcac cgtcctgcac caggactggc tgaacggcaa ggagtacaag tgcaaggtct ccaacaaagg cctcccgtcc tccatcgaga aaaccatctc caaagccaaa gggcagcccc gagagccaca ggtgtacacc ctgcccccat cccaggagga gatgaccaag aaccaggtca gcctgacctg cctggtcaaa ggcttctacc ccagcgacat cgccgtggag tgggagagca atgggcagcc ggagaacaac tacaagacca cgcctcccgt gctggactcc gacggctcct tcttcctcta cagcaggcta accgtggaca agagcaggtg gcaggagggg aatgtcttct catgctccgt gatgcatgag gctctgcaca accactacac acagaagagc ctctccctgt ctctgggtaa a SEQ ID NO: 176 agctttctgg ggcaggccgg gcctgacttt ggctgggggc agggaggggg ctaaggtgac gcaggtggcg ccagccaggt gcacacccaa tgcccatgag cccagacact ggaccctgca tggaccatcg cggatagaca agaaccgagg ggcctctgcg ccctgggccc agctctgtcc cacaccgcgg tcacatggca ccacctctct tgcagcttcc accaagggcc catccgtctt ccccctggcg ccctgctcca ggagcacctc cgagagcaca gccgccctgg gctgcctggt caaggactac ttccccgaac cggtgacggt gtcgtggaac tcaggcgccc tgaccagcgg cgtgcacacc ttcccggctg tcctacagtc ctcaggactc tactccctca gcagcgtggt gaccgtgccc tccagcagct tgggcacgaa gacctacacc tgcaacgtag atcacaagcc cagcaacacc aaggtggaca agagagttgg tgagaggcca gcacagggag ggagggtgtc tgctggaagc caggctcagc cctcctgcct ggacgcaccc cggctgtgca gccccagccc agggcagcaa ggcatgcccc atctgtctcc tcacccggag gcctctgacc accccactca tgctcaggga gagggtcttc tggatttttc caccaggctc ccggcaccac aggctggatg cccctacccc aggccctgcg catacagggc aggtgctgcg ctcagacctg ccaagagcca tatccgggag gaccctgccc ctgacctaag cccaccccaa aggccaaact ctccactccc tcagctcaga caccttctct cctcccagat ctgagtaact cccaatcttc tctctgcaga gtccaaatat ggtcccccat gcccaccttg cccaggtaag ccaacccagg cctcgccctc cagctcaagg cgggacaggt gccctagagt agcctgcatc cagggacagg ccccagccgg gtgctgacgc atccacctcc atctcttcct cagcacctga gttcctgggg ggaccatcag tcttcctgtt ccccccaaaa cccaaggaca ctctcatgat ctcccggacc cctgaggtca cgtgcgtggt ggtggacgtg agccaggaag accccgaggt ccagttcaac tggtacgtgg atggcgtgga ggtgcataat gccaagacaa agccgcggga ggagcagttc aacagcacgt accgtgtggt cagcgtcctc accgtcctgc accaggactg gctgaacggc aaggagtaca agtgcaaggt ctccaacaaa ggcctcccgt cctccatcga gaaaaccatc tccaaagcca aaggtgggac ccacggggtg cgagggccac acggacagag gccagctcgg cccaccctct gccctgggag tgaccgctgt gccaacctct gtccctacag ggcagccccg agagccacag gtgtacaccc tgcccccatc ccaggaggag atgaccaaga accaggtcag cctgacctgc ctggtcaaag gcttctaccc cagcgacatc gccgtggagt gggagagcaa tgggcagccg gagaacaact acaagaccac gcctcccgtg ctggactccg acggctcctt cttcctctac agcaggctaa ccgtggacaa gagcaggtgg caggagggga atgtcttctc atgctccgtg atgcatgagg ctctgcacaa ccactacaca cagaagagcc tctccctgtc tctgggtaaa tgagtgccag ggccggcaag cccccgctcc ccgggctctc ggggtcgcgc gaggatgctt ggcacgtacc ccgtctacat acttcccagg cacccagcat ggaaataaag cacccaccac tgccctgggc ccctgtgaga ctgtgatggt tctttccacg ggtcaggccg agtctgaggc ctgagtgaca tgagggaggc agagcgggtc ccactgtccc cacactgg

EXAMPLES

The present invention is further illustrated by the following examples which should not be construed as further limiting. The contents of all figures and all references, patents and published patent applications cited throughout this application are expressly incorporated herein by reference.

Example 1—CTLA-4 Binding Domains

CTLA-4 binding domain polypeptides were selected and expressed as described in WO 2014/207063 (see Examples) and were assayed for binding to CTLA-4 by at least one of ELISA and surface plasmon resonance as described below.

Binding ELISA

96-well flat bottom high binding plates (Greiner, #655074) were coated with either CTLA4-Fc (Fitzgerald, #30R-CD152) or CD28-Fc (R&D systems, 342-CD) by incubating overnight at 4° C. The plates were washed (Wash buffer: PBS+0.05% Tween 20 (PBST) Medicago, #09-9410-100) and then blocked in PBST+3% BSA (Merck, #1.12018.0100). The plates were washed again and sample or controls (serially diluted 1/5 from 200-0,001 μg/ml) were added to the wells. The samples were incubated for 1 h at room temperature and then washed. Detection antibody, goat-anti-human IgG Fcγ-HRP (Jackson, #109-035-098) was added and the plates were subsequently developed using SuperSignal Pico Chemiluminescent substrate (Thermo Scientific, #37069) and detected with an Envision reader (Perkin Elmer). EC50 values were calculated for both CTLA4 and CD28. The binding ratio (EC50 binding ratio=[EC50 for CD28]÷[EC50 for CTLA-4]) was calculated for each polypeptide and is shown in Table 1.1.

Surface Plasmon Resonance

Either CTLA4-Fc (Fitzgerald, #30R-CD152) or CD28-Fc (R&D Systems, 342-CD) was immobilized to the Biacore™ sensor chip, CMS, using conventional amine coupling. The CD86 mutant molecules and controls (serially diluted 1/2 100-1.5 nM) were analyzed for binding in HBS-P (GE, BR-1003-68) at a flow rate of 30 μl/ml. The association was followed for 3 minutes and the dissociation for 10 minutes. Regeneration was performed twice using 5 mM NaOH for 30 seconds. The kinetic parameters and the affinity constants were calculated using BIAevaluation 4.1 software (Table 1.3).

Inhibition ELISA

96-well flat bottom plate high binding plates (Greiner, #655074) were coated with wildtype CD86-Fc (R&D Systems, #7625-B2) by incubating overnight at 4° C. The plates were washed (Wash buffer: PBS+0.05% Tween 20 (PBST) Medicago, #09-9410-100) and then blocked in PBST+3% BSA (Merck, #1.12018.0100). The sample (CD86 mutant or wild type protein; serially diluted 1/4 from 30000 to 0.3 ng/ml) was incubated with biotinylated-CTLA4 (Fitzgerald, #30R-CD152) in room temperature 1 h, the mixture was then added to the blocked wells in the ELISA plate. Detection was performed with Streptavidin-HRP (Pierce, #21126) and the plates were subsequently developed using SuperSignal Pico Chemiluminescent substrate (Thermo Scientific, #37069) and detected with Envision reader (Perkin Elmer). The results are shown in FIG. 2. IC50 values were calculated and are shown in the tables below. All molecules tested showed better IC50 value than both wild type and H79A, the IC of the best mutant CD86 molecule was improved over 100-fold compared to wild type. Results for exemplary molecules 900, 901, 904, 906, 907, 908, 910, 915 and 938 are shown in Table 1.1. Kd binding ratio=[Kd for CD28]÷[Kd for CTLA-4]. The full amino acid sequences for exemplary molecules 900, 901, 904, 906, 907, 908, 910, 915 and 938 are provided as SEQ ID NOs: 6 to 14, respectively.

TABLE 1.1 Mutated positions and amino acid change EC50 Kd Sam- relative to wild-type binding binding ple (positions numbered as in FIG. 4) ratio ratio 900 H79D, L107I, I111V, T118S, M120L, 3.5 ND* I121V, R122K, Q125E 901 Q48L, S49T, L107I, I111V, R122K, 17.2 2.7 Q125E, A134T 904 V54I, K74R, S77A, H79D, L107I, 12.2 6.8 T118S, I121V, R122K, N127D 906 F32I, Q48L, K74R, H79D, L107F, 16.2 0.8 M120L, I121V, R122K, Q125E 907 R122K, Q125E 30.5 5.6 908 L107I, I121V, R122K, Q125E 6.2 4.7 910 H79D, L107I, I121V, R122K, Q125E 7.7 5.1 915 V64I, H79D, L107F, T118S, M120L, 9.9 1.9 R122K, N127D 938 V64I, L107I, I121V, R122K 2.0 5.5 Wild type 3.4 1.6 *No detectable binding was seen in the BIAcore ™ analysis nor binding ELISA

Results for exemplary molecules 1038, 1039, 1040, 1041,1042, 1043, 1044, 1045, 1046 and 1047 are shown in Tables 1.2 and 1.3, and in FIGS. 2 and 3. The full amino acid sequences for exemplary molecules 1038, 1039, 1040, 1041, 1042, 1043, 1044, 1045, 1046 and 1047 are provided as SEQ ID NOs: 15 to 24, respectively.

TABLE 1.2 Sample EC50 Sample IC50 1038 0.14 — — 1039 0.039 — — 1040 0.0076 1040 0.049 1041 0.087 1041 3.1 1042 0.29 1042 4.3 1043 0.035 1043 4.0 1044 0.029 1044 1.4 1045 0.047 1045 2.6 1046 0.019 1046 1.1 1047 0.037 1047 0.98 Wild type 0.51 Wild type 15 Prior Art 0.81 H79A 25 Negative No Negative No control activity control activity

TABLE 1.3 Mutated positions and Sam- amino acid change ka kd K_(D) ple (positions numbered as in FIG. 4) (1/Ms) (1/s) (nM) 1038 Q48L, H79D, L107I, I121V, 1.0e6 0.012 12 R122K, Q125E 1039 Q48L, H79S, L107I, T118S, 1.0e6 8.5e−3 8 I121V, R122K, N127D 1040 Q48L, K74R, H79D, L107R, R122N 1.0e6 3.2e−3 3 1041 F32L, Q48L, H79D, L107I, 7.0e5 8.4e−3 12 M120L, I121V, R122K, 125E 1042 Q48L, K74I, H79S, L107I, 4.4e5 0.011 25 T118S, I121V, R122K, N127D 1043 Q48L, H79D, L107I, R122K, Q125E 1.1e6 0.011 10 1044 Q48L, S49T, H79S, L107I, 1.1e6 9.4e−3 8 R122K, Q125E, N127S 1045 Q48L, S49T, H79D, M120L, 9.4e5 8.3e−3 9 I121V, R122K, Q125E 1046 H79D, K103E, L107I, T118S, 1.4e6 8.0e−3 6 I121V, R122K, N127D 1047 Q48L, H79D, L107I, M120L, 8.5e5 8.4e−3 10 I121V, R122K, Q125E Wild 4.6e5 0.023 50 type H79A 3.4e5 0.022 63

Example 2—Cross Reactivity to Murine CTLA-4 of Exemplary Polypeptide from Clone 1040

The relative affinity for murine and human CTLA-4 of an exemplary mutant CD86 molecule 1040 was investigated using an inhibition ELISA binding assay. The 1040 molecule used in these experiments was conjugated to an anti-CD40 antibody as part of a bispecific molecule. The CTLA-4 binding properties of the CD86 molecule are not affected by this conjugation (data not shown).

In brief, 96-well flat bottom plate high binding plates (Greiner #655074) were coated with human CTLA-4 (Fitzgerald) incubating overnight at 4° C. The plates were washed (Wash buffer: PBS+0.05% Tween 20 (PBST) Medicago #09-9410-100) and then blocked in PBST+3% BSA (Merck, #1.12018.0100).

The sample (exemplary CD86 mutant) was pre-incubated at room temperature for 1 hour with soluble biotinylated human CTLA4 (Fitzgerald #30R-CD152) or soluble murine CTLA-4 (R&D systems) at different concentrations (serial dilutions 1/4 from 30000 to 0.3 ng/ml).

The mixture was then added to the blocked wells in the ELISA plate. Detection was performed with Streptavidin-HRP (Pierce, #21126) and the plates were subsequently developed using SuperSignal Pico Chemiluminescent substrate (Thermo Scientific, #37069) and detected with Envision reader (Perkin Elmer). The results are shown in FIG. 5. The observed inhibition curves with murine and human CTLA-4 demonstrate that the binding affinity of the exemplary CD86 mutant (1040) to the two forms of CTLA-4 is of a similar magnitude. The other clones tested in Example 1 were also found to bind to murine CTLA-4 (data not shown).

Example 3—Characterisation of OX40 Antibodies

Characteristics of exemplary OX40 antibodies are summarised in Table 3.1 below.

TABLE 3.1 Dose huOX40 Dissociation Association Association CDR H3 response M. mulatta binding constant rate constant rate constant length ELISA T-cell OX40 FACS Hydrophathy Isoelectric K_(D) ka kd Antibody (IMGT) (IgG) agonist binding (CHO) index point (M) (1/Ms) (1/s) 1166/1167 10 <1 nM Yes Yes Yes −0.392 9.11 3.22E−10 9.01E+04 2.90E−05 1170/1171 10 <1 nM Yes Yes Yes −0.415 9.11 2.50E−10 1.45E+06 3.63E−04 1164/1135 11 <1 nM Yes Yes Yes −0.398 9.21 3.08E−10 2.51E+05 7.73E−05 1168/1135 11 <1 nM Yes Yes Yes −0.404 9.19 3.27E−10 5.18E+05 1.69E−04 1482/1483 9 <1 nM Yes Yes Yes −0.381 9.19 7.53E−10 7.76E+05 5.84E−04 1490/1135 11 <1 nM Yes Yes Yes −0.407 9.18 3.07E−10 3.87E+06 1.19E−03 1514/1515 14 <1 nM Yes Yes Yes −0.399 9.11 6.40E−10 2.57E+05 1.64E−04 1520/1135 17 <1 nM Yes Yes Yes −0.394 9.18 5.55E−10 6.20E+05 3.44E−04 1524/1525 10 <1 nM Yes Yes Yes −0.391 9.11 8.11E−10 1.71E+06 1.39E−03 1526/1527 15 <1 nM Yes Yes Yes −0.388 8.99 4.30E−10 4.35E+05 1.87E−04 1542/1135 11 <1 nM Yes Yes Yes −0.411 9.2 4.63E−10 2.16E+05 1.00E−04

Two anti-OX40 antibodies were synthesised solely for use as reference antibodies for the purposes of comparison in these studies. They are designated herein as “72” or “72/76”, and “74” or “74/78”, respectively.

Measurement of Kinetic Constants by Surface Plasmon Resonance

Human OX40 (R&D systems, #3358_OX) was immobilized to the Biacore™ sensor chip, CMS, using conventional amine coupling. The tested antibodies and controls (serially diluted 1/3 or 1/2 100-2 nM) were analyzed for binding in HBS-P (GE, # BR-1003-68) at a flow rate of 30 μl/ml. The association was followed for 3 minutes and the dissociation for 20 minutes. Regeneration was performed twice using 50 mM NaOH for 60 seconds. The kinetic parameters and the affinity constants were calculated using 1:1 Langmuir model with drifting baseline. The tested antibodies were overall in the subnanomolar-nanomolar range with varying on and off rates (FIG. 6 and Table 3.1). Most of the antibodies had affinities <5 nM. The kinetic parameters and the affinity constants were calculated using BIAevaluation 4.1 software.

Measurement by ELISA of Binding to Human and Murine OX40, and to CD137 and CD40 by ELISA

ELISA plates were coated with human OX40 (R&D Systems, 3388-OX), CD40 (Ancell), or CD137 (R&D Systems) at 0.1 or 0.5 μg/ml. The ELISA plates were washed with PBST and then blocked with PBST+2% BSA for 1 h at room temperature and then washed again with PBST. The antibodies were added in dilution series to the ELISA plates for 1 h at room temperature and then washed with PBST. Binding was detected using goat anti human kappa light chain HRP, incubated for 1 h at room temperature. SuperSignal Pico Luminescent was used as substrate and luminescence was measured using Fluostar Optima.

All the tested OX40 antibodies bound to human OX40 and displayed EC50 value below 1 nM. The antibodies did not bind to murine OX40 or to the other TNFR super family members tested (data not shown).

Measurement of Binding to Human OX40 Over-Expressed on CHO Cells

The extracellular part of human OX40 was fused to the transmembrane and intracellular part of hCD40 and cloned into pcDNA3.0. The vector was subsequently stably transfected into CHO cells. Expression of OX40 was confirmed by incubating with commercial OX40 antibody (huOX40, BD Biosciences) for 30 min at 4° C. and then detected with a-huIgG-PE (Jackson Immunoresearch) 30 min 4° C. For the assay, the transfected cells were incubated with the test antibodies and controls for 30 min at 4° C. and then detected with a-huIgG-PE (Jackson Immunoresearch) 30 min 4° C. Cells were analyzed by flow cytometry with FACS Verse (BD Biosciences).

All clones bound to hOX40 overexpressed on CHO cells in a dose dependent manner (FIG. 7).

Example 4—Sequence Analysis of OX40 Antibodies

The CDR sequences of both the heavy and light chain variable regions were analysed for each antibody. Table 4.1 illustrates the analysis as conducted for the VH CDR3 sequences. Positions in Table 4.1 are defined according to IMGT numbering system. The following patterns were identified.

The VH regions all comprise:

(a) a heavy chain CDR1 sequence which is 8 amino acids in length and comprises the consensus sequence: “G, F, T, F, G/Y/S, G/Y/S, Y/S, Y/S/A”;

(b) a heavy chain CDR2 sequence which is 8 amino acids in length and comprises the consensus sequence: “I, G/Y/S/T, G/S/Y, S/Y, G/S/Y, G/S/Y, G/S/Y, T”; and

(c) a heavy chain CDR3 sequence which is 9 to 17 amino acids in length and which comprises the consensus sequence of: “A, R, G/Y/S/H, G/Y/F/V/D, G/Y/P/F, −/H/S, −/N/D/H, −/Y/G, −/Y, −/Y, −/W/A/V, −/A/Y, −/D/A/Y/G/H/N, Y/S/W/A/T, UM/I/F, D, Y”.

The VL regions all comprise:

(a) a light chain CDR1 sequence which consists of the sequence: “Q, S, I, S, S, Y”;

(b) a light chain CDR2 sequence which consists of the sequence: “A, A, S”;

(c) a light chain CDR3 sequence which is 8 to 10 amino acids in length and comprises the consensus sequence: “Q,Q, S/Y/G, −/Y/H/G, −/S/Y/G/D, S/Y/G/D, S/Y/G/T, P/L, Y/S/H/L/F, T”.

Within the consensus sequence for the heavy chain CDR3, two sub-families were identified. Each antibody in the first sub-family comprises a VH CDR3 sequence of 10 amino acids in length which comprises the consensus sequence “A, R, Y/H, D, Y, A/Y/G, S/W/A, M/L, D, Y”. Antibodies in this family are referred to as family Z and are identified as such in Table 4.1. Each antibody in the second sub-family comprises a VH CDR3 sequence of 11 amino acids in length which comprises the consensus sequence “A, R, G/Y, V/F/Y, P, H, G/Y/H, Y, F/I, D, Y”. Antibodies in this family are referred to as family P and are identified as such in Table 4.1. Antibodies of family Z or P are preferred. Antibodies having a VH sequence in family P typically also include a VL sequence with a CDR3 sequence of “Q, Q, S, Y, S, T, P, Y, T”, a CDR1 sequence “Q,S,I,S,S,Y” and a CDR2 sequence of “A,A,S”. Accordingly antibodies with a VL region comprising these three CDR sequences are preferred.

TABLE 4.1 CDRH3 FAM- VH 105 106 107 108 109 110 111 111.1 111.2 112.2 112.1 112 113 114 115 116 117 LENGTH ILY 1482 A R G Y G Y L D Y 9 1166 A R Y D Y A S M D Y 10 Z 1170 A R Y D Y Y W M D Y 10 Z 1524 A R H D Y G A L D Y 10 Z 1164 A R G V P H G Y F D Y 11 P 1168 A R Y F P H Y Y F D Y 11 P 1490 A R Y Y P H H Y I D Y 11 P 1542 A R G Y P H H Y F D Y 11 P 1514 A R S G Y S N W A N S F D Y 14 1526 A R Y Y F H D Y A A Y S L D Y 15 1520 A R Y Y Y S H G Y Y V Y G T L D Y 17

Example 5—Domain Mapping of OX40 Antibodies

The extracellular part of OX40 consists of four domains, each of which can be subdivided into two modules. Genes of OX40 human/mouse chimeras were synthesized using standard laboratory techniques. The different chimeras were designed by exchanging domains or modules of the human OX40 with corresponding mouse OX40. The chimeras were designed based on evaluation of the human and mouse sequences and 3D investigation of human OX40. The synthesized genes were assigned project specific ID numbers (see Table 5.1). The constructs were cloned into pcDNA3.1 vector (Invitrogen).

The mouse/human chimeras were transiently transfected into FreeStyle 293-F cells (Invitrogen), incubated 48 hours in FreeStyle 293 expression medium (Invitrogen) 37 C, 8% CO₂, 135 rpm. The transfected cells were incubated with human OX40 antibodies, human OX40L (hOX40L, RnD Systems), mouse OX40L (mOX40L, RnD Systems) and controls for 30 min 4° C. and then detected with a-huIgG-PE (Jackson Immunoresearch) 30 min 4° C. Cells were analyzed with FACS Verse (BD Biosciences). Binding to the different chimeric constructs were calculated as relative (mean fluorescence intensity) MFI compared to the binding of the isotype control. Results are shown in Table 5.2.

None of the human OX40 antibodies tested bind to murine OX40. Accordingly, if a given antibody does not bind to a particular chimera, this indicates that the antibody is specific for one of the domains which has been replaced with a murine domain in that chimera.

TABLE 5.1 Identity of chimeric constructs ID Description of coding region construct of the chimeric DNA constructs 1544 Human OX40 with mouse domains 1A, 1B and 2A (aa 30-81) 1545 Human OX40 with mouse domains 1B, 2A and 2B (aa 43-107) 1546 Human OX40 with mouse domains 2A, 2B and module 3 (aa 66-126) 1547 Human OX40 with mouse domain 2B, module 3 and domain 4A (aa 83-141) 1548 Human OX40 with mouse module 3 and domains 4A and 4B (aa 108-167) 1549 Human OX40 with mouse domains 1A and 4B and region non-annotated extracellular region (aa 30-65 and aa 127-214) 84 Construct containing the full length OX40 sequence 57 Empty vector (negative control)

At least four separate binding patterns were identified.

Pattern A:

Antibodies 1170/1171, 1524/1525, and 1526/1527 display a similar binding pattern and depend on residues in the same domains for binding. Amino acid residues critical for binding are likely located in module B in domain 2, and in module A of domain 2. The majority of the antibodies with CDRH3 family “Z” bind according to pattern A (1166/1167 being the exception), indicating that antibodies with this type of CDRH3 are predisposed to bind this epitope.

Pattern B:

Antibodies 1168/1135, 1542/1135, 1520/1135, 1490/1135, 1482/1483 and 1164/1135 display a similar binding pattern and depend mainly on residues located in Domain 3 for binding. All antibodies with CDRH3 family “P” binds with this pattern, demonstrating that the similarity in CDRH3 sequence reveals a common binding epitope.

Pattern C:

Antibody 1166/1167 has a unique binding pattern and likely depends on residues located in module A and module B in domain 2 for binding. However, both modules must be exchanged simultaneously to abolish binding, suggesting a structurally complex epitope.

Pattern D:

Antibody 1514/1515 displays a unique binding profile and likely depends mostly on amino acids located in module B in domain 2 for binding.

Reference antibody 72 binds according to pattern B. The binding pattern of the human OX40 ligand is similar to pattern C.

TABLE 5.2 Results from domain mapping experiment Chimeric Antibody OX40 1490/ 1170/ 1524/ 1526/ 1482/ 1514/ 1164/ 1168/ 1520/ 1542/ 1166/ polyclonal construct 1135 1171 1525 1527 1483 1515 1135 1135 1135 1135 1167 antibody 1544 4.2 2.0 1.5 1.1 8.4 11.6 14.0 13.2 9.4 7.1 14.2 50.9 1545 28.9 1.0 0.9 1.3 44.4 1.2 37.3 46.6 32.6 40.2 1.0 58.6 1546 1.0 0.8 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.8 30.0 1547 1.1 2.3 1.0 1.0 1.0 1.1 1.0 1.0 0.9 1.0 15.2 43.9 1548 1.1 20.3 15.4 12.7 1.1 17.2 1.0 1.0 1.1 1.2 15.8 31.7 1549 5.9 12.1 11.2 8.5 8.7 10.6 14.1 15.1 8.5 13.0 11.3 26.3 84 14.2 33.4 31.4 21.4 24.9 25.9 27.5 29.6 25.4 29.4 27.6 53.2 57 1.0 1.0 1.0 1.0 1.0 1.1 1.0 0.9 1.0 1.1 1.0 1.2

Example 6—Cross Reactivity with Macaca mulatta

The extracellular part of OX40 from Macaca mulatta was fused to the transmembrane and intracellular part of hCD40 and cloned into pcDNA3.0. The vector was subsequently stably transfected into HEK cells (macOX40-HEK).

Expression of OX40 was confirmed by incubating with commercial OX40 antibody (huOX40, BD Biosciences) for 30 min at 4° C. and then detected with a-huIgG-PE (Jackson Immunoresearch) 30 min 4° C. For the assay, the transfected cells were incubated with the test antibodies and controls for 30 min at 4° C. and then detected with a-huIgG-PE (Jackson Immunoresearch) 30 min 4° C. Cells were analyzed by flow cytometry with FACS Verse (BD Biosciences).

As shown in Table 6.1 below, tested antibodies bind to Macaca mulatta OX40 with EC50 values comparable to those achieved for human OX40, suggesting that Macaca mulatta will be suitable for use in toxicology studies.

Macaca mulatta is genetically very similar to Macaca fascicularis (cynomolgus monkey) making it very likely that cynomolgus monkey is also a suitable species for toxicology studies.

TABLE 6.1 Binding to human and monkey OX40 (95% confidence intervals) OX40 Binding to M mulatta Binding to human antibody OX40, EC50 (μg/mL) OX40, EC50 (μg/mL) 1166/1167 0.1595 to 0.2425 0.1415 to 0.2834 1168/1135 0.09054 to 0.1939 0.06360 to 0.1308 1482/1483 0.1565 to 0.3120 0.08196 to 0.1822 1520/1135 0.1632 to 0.3587 0.09247 to 0.2749 1526/1527 0.2921 to 0.5888 0.1715 to 0.4292 1542/1135 0.7221 to 1.414 0.3223 to 0.5525

Example 7—Agonistic Activity in a Human T Cell Assay

Human T cells were obtained by negative T cell selection kit from Miltenyi from PBMC from leucocyte filters obtained from the blood bank (Lund University Hospital). The OX40 antibodies were coated to the surface of a 96 well culture plate (Corning Costar U-shaped plates (#3799) and cultured with a combination of immobilized anti-CD3 antibody (UCHT1), at 3 μg/ml, and soluble anti-CD28 antibody (CD28.2), at 5 μg/ml. Anti-CD3 was pre-coated overnight at 4° C. On the following day, after one wash with PBS, the OX40 antibodies were coated 1-2 h at 37° C. After 72 h incubation in a moisture chamber at 37° C., 5% CO₂ the IL-2 levels in the supernatant were measured.

The ability of the antibodies to stimulate human T cells to produce IL-2 was compared with the reference antibody 74 and the relative activity is displayed in FIG. 8. The majority of the antibodies provided T cell activation levels that were comparable with the reference antibody. A number of antibodies provided higher levels of T cell activation.

Bispecific Molecules

In the following Examples, tested bispecific molecules are referred to by number, e.g. 1164/1141. This means that the molecule comprises the amino acid sequences of the respective VH and VL regions shown in Tables B and D. For example, 1164/1141 comprises the heavy chain VH region sequence 1164 shown in Table B (SEQ ID NO: 99), and the bispecific chain number 1141 shown in Table D (SEQ ID NO: 129). The specified VH region sequence of a given molecule is typically provided linked (as part of a single contiguous polypeptide chain) to the IgG1 heavy chain constant region sequence of SEQ ID NO: 135. This sequence is typically present at the C terminal end of a specified VH region sequence of Table B.

Example 8—Affinity of Exemplary Bispecific Molecules for Binding to Single Targets

Measurement of Kinetic Constants by Surface Plasmon Resonance

Human OX40 (R&D systems, #3358_OX) was immobilized to the Biacore™ sensor chip, CMS, using conventional amine coupling. The tested antibodies and controls (serially diluted 1/3 or 1/2 100-2 nM) were analyzed for binding in HBS-P (GE, # BR-1003-68) at a flow rate of 30 μl/ml. The association was followed for 3 minutes and the dissociation for 20 minutes. Regeneration was performed twice using 50 mM NaOH for 30 seconds. The kinetic parameters and the affinity constants were calculated using 1:1 Langmuir model with drifting baseline. The tested molecules had varying on and off rates with generally lower affinity for OX40 than the corresponding monomeric antibodies, but were still in the nanomolar range (Table 8.1).

TABLE 8.1 BsAb ka (1/Ms) kd (1/s) KD (nM) 1164/1141 8.87E+04 1.72E−04 1.94 1168/1141 2.84E+05 3.05E−04 1.07 1166/1261 7.04E+04 1.12E−04 1.59 1170/1263 5.18E+05 6.39E−04 1.23

Measurement by ELISA

ELISA plates were coated with human with CTLA-4 (BMS, Orencia) or human OX40 (R&D Systems, 3388-OX) at 0.4 or 0.5 μg/ml, respectively. The ELISA plates were washed with PBST and then blocked with PBST+2% BSA for 1 h at room temperature and then washed again with PBST. The bispecific molecules were added in dilution series to the plates and incubated for 1 h at room temperature. The ELISA plates were washed, and binding was detected using goat anti human kappa light chain HRP for 1 h at room temperature. SuperSignal Pico Luminescent was used as substrate and luminescence was measured using Fluostar Optima.

All the tested bispecific molecules bound to both targets and the EC50 values are in the range that would be expected based on their affinity as monospecific antibodies (FIG. 9).

Example 9—Dual Binding to Both Targets of Exemplary Bispecific Molecules

Measurement by Surface Plasmon Resonance

Human OX40 (R&D systems, #3358_OX) was immobilized to the Biacore™ sensor chip, CMS, using conventional amine coupling. The tested bispecific molecules (0.5 μM or 0.25 μM) and controls were run over the chip at a flow rate of 30 μl/ml. The association was followed for 3 minutes and the dissociation for 3 minutes. CTLA4-Fc (BMS, Orencia) was then injected and association followed for 3 minutes and the dissociation for 3 minutes. As a control a blank PBS was injected instead of CTLA4.

All the tested bispecific molecules bound to both targets simultaneously, as is shown in FIG. 10).

Measurement by ELISA

ELISA plates were coated with OX40-Fc (R&D systems, #3358_OX) (0.4 μg/ml) over night at 4° C. The ELISA plates were washed with PBST and then blocked with PBST+2% BSA for 1 h at room temperature and then washed again with PBST. Bispecific molecules were added in dilutions to the plates and incubated for 1 h at room temperature. The ELISA plates were washed and biotinylated CTLA-4 (1 μg/ml) was added and incubated on the plates at room temperature. The plates were washed and HRP-labelled streptavidin was used for detection of binding. SuperSignal Pico Luminescent was used as substrate and luminescence was measured using Fluostar Optima.

Binding to both targets was confirmed for all tested bispecific molecules. As is shown in FIG. 11, the tested bispecific molecules could be detected at a concentration 0.1 nM, which corresponds to 0.015 μg/ml. The relative values in the assay correspond well to the affinities measured by surface plasmon resonance.

Example 10—Agonistic Activity of Exemplary Bispecific Molecules in a Human CD4 T Cell Assay

Human CD4 T cells were isolated by negative CD4 T cell selection (Miltenyi, human CD4+ T cell Isolation Kit 130-096-533) of PBMC from leucocyte filters obtained from the blood bank (Lund University Hospital). CTLA-4 (Orencia, 2.5 μg/ml) and anti-CD3 (UCHT-1, 1 ug/ml) was coated to the surface of a 96-well culture plate (non-tissue cultured treated, U-shaped 96-well plates (Nunc, VWR #738-0147) over night at 4° C. By coating with both CTLA-4 and CD3, the assay provides an experimental model of a tumor microenvironment with over-expressed CTLA-4. CTLA-4 was omitted from some wells as a control.

Bispecific molecules to be tested were added soluble in a serial dilution to the wells and compared at the same molar concentrations with controls. Two different controls were used for each bispecific molecule tested. The first control is a bispecific molecule designated 1756/1757 (an isotype control antibody fused to the 1040 CTLA4 binding region=binds CTLA4 but not OX40). The second control is a mixture of the bispecific 1756/1757 control and the monospecific OX40 antibody, which corresponds to the tested bispecific molecule. After 72 h of incubation in a moisture chamber at 37° C., 5% 002, IL-2 levels were measured in the supernatant.

As shown in FIG. 12, there is a dose-dependent effect of the bispecific molecules, which induce an increase in human T cell activation (measured by an increase in IL-2 production) when cultured in plates coated with CTLA-4. The controls do not. FIG. 13 shows the results of the same assay when conducted at a fixed concentration for the bispecific antibodies and controls (1.5 nM) in the presence or absence of CTLA-4. The increase in T cell activation is not seen in the absence of CTLA-4. The fold change in IL-2 levels induced by each bispecific molecule compared to the corresponding combination of monospecific molecules is shown in Table 10.1. The mean value of IL-2 produced (pg/ml) for each bispecific molecule or control is shown in Table 10.2.

Since this assay represents an experimental model of a tumor microenvironment with over-expressed CTLA-4, the results suggest that the tested bispecific molecules can be expected to have a greater effect than monospecific antibodies in such a microenvironment.

TABLE 10.1 Fold change in IL-2 level induced by bispecific molecule compared to the corresponding 1164/1141 1166/1261 1168/1141 1170/1141 1514/1581 1520/1141 7.6 7.8 7.2 4.7 5.5 1.7

combination of the monospecific molecules at 1.5 nM

TABLE 10.2 Mean IL-2 level (pg/ml) induced at 1.5 nM bispecific antibody or control 1164/1135 + 1166/1167 + 1168/1135 + 1170/1171 + 1164/1141 1166/1261 1756/1757 1756/1757 1168/1141 1170/1141 1756/1757 1756/1757 1514/1581 1520/1141 Mean 5024 4292 665 550 2681 2575 371 552 5109 1303 SD 1058 1333 273 456 954 992 162 285 2600 812 1514/1515 + 1520/1135 + 1526/1527 + 1542/1543 + 1756/1757 1756/1757 1526/1585 1542/1141 1756/1757 1756/1757 1756/1757 Mean 927 774 3200 2671 746 697 1047 SD 653 451 1350 1016 346 418 601

Example 11—Stability of Exemplary Bispecific Molecules

The melting point of the antibodies was analyzed by differential scanning fluorimetry (DSF). Antibody samples in PBS were mixed with SYPRO Orange which was diluted 1000-fold. Thermal scanning between 25 and 95° C. was performed in a real-time PCR machine with measurements made each degree. A reference antibody 250/251 was used for comparison and the difference in melting temperature Tm (ΔT_(m)) relative to the reference was determined. T_(m) differences of more than 1.1° C. compared to the reference are considered statistically significant. As shown in Table 11.1, all tested bispecific molecules displayed good thermostability with values of 65° C. or above.

TABLE 11.1 Melting temperature Antibody (° C.) 1168/1141 65.6 1164/1141 65.5 1160/1259 68.5 1166/1261 67.8 1170/1263 66.4 1514/1581 65.3 1520/1141 65.0 1526/1585 67.6 1542/1141 66.3

Example 12—Characterisation of CD137 Antibodies

General chemical properties of an exemplary CD137 antibody (referred to as 1204/1205) were determined by routine analysis and are shown in Table 12.1.

TABLE 12.1 net charge (in Hydrophathy Melting oxidizing Hydrophathy (GRAVY Temper- conditions) (GRAVY index) CDRs ature Anti- pH pH index) according to (C°) body pI 5.5 7.4 whole mAb IMGT Tm1 1204/ 9.05 32.9 7.4 −0.401 −0.465 68 1205

Measurement of Kinetic Constants by Surface Plasmon Resonance

Human CD137 (R&D systems) was immobilized to the Biacore™ sensor chip, CMS, using conventional amine coupling. The tested antibodies and controls (serially diluted 1/2 10-0.63 nM) were analyzed for binding in HBS-P (GE, # BR-1003-68) at a flow rate of 30 μl/ml. The association was followed for 5 minutes and the dissociation for 15 minutes. Regeneration was performed twice using 10 mM Glycine pH1.7 for 30 seconds. The kinetic parameters and the affinity constants were calculated using 1:1 Langmuir model. As a representative example, the 1204/1205 anti-CD137 antibody has an affinity in the low nanomolar range. See Table 12.2.

TABLE 12.2 Dissociation constant K_(D) (M) 1.1E−09 Association rate constant k_(a) (1/Ms) 2.5E+05 Dissociation rate constant k_(d) (1/s) 2.8E−04

Measurement by ELISA of Binding to Human CD137

Binding of CD137 mAb to recombinant human CD137 was determined by sandwich ELISA. Briefly, ELISA plates (Greiner #655074) were coated with recombinant human CD137-Fc (R&D #838-4B) at 0.5 μg/ml, or alternatively 0.05 μg/ml at 4° C. overnight or 37° C. for 1 hour. The plates were washed three times with PBS+0.05% Tween 20 (PBST) and blocked with PBST+1% BSA. The CD137 antibodies to be tested were added in serial dilution series and the incubated for 1 h at room temperature prior to wash with PBST. Binding was detected using HRP-conjugated goat-anti-human kappa light chain (AbD Serotec # STAR127P) and developed with SuperSignal ELISA Pico Chemiluminescent substrate (Pierce #37069) measured using a Fluostar Optima. EC50 values of the various mAb were determined in 2-6 separate experiments.

As a representative example, the 1204/1205 anti-CD137 antibody has an EC50 value of approximately 0.3 nM when assessed by this method. See Table 12.3.

TABLE 12.3 Clone name Mean (nM) SD n 1204/1205 0.34 0.058 6 n = number of data points, including separate experiments and different antibody batches in same experiment

Measurement of Binding to Human or Cynomolgus CD137 Over-Expressed on CHO Cells

The extracellular part of human or cynomolgus CD137 was fused to the transmembrane and intracellular part of hCD40 and cloned into pcDNA3.0. The vector was subsequently stably transfected into CHO cells. Expression of CD137 was confirmed by incubating with commercial CD137 antibody (huCD137-PE, BD Biosciences #555956) for 30 min at 4° C.

For the assay, the transfected cells were incubated with the test antibodies and controls for at least 1 hr at 4° C. to saturate binding. In order to minimize antibody internalization, 0.05% sodium azide was used in the incubation buffer and all work was performed on ice. Detection was achieved using an anti-hIgG-PE antibody (109-115-098, Jackson Immunoresearch laboratories) incubated for 30 min at 4° C. Directly after staining, the cells were fixed with a paraformaldehyde solution (10× concentrate BD CellFIX, BD biosciences #340181). Cells were analyzed by flow cytometry using FACSVerse (BD Biosciences). The median fluorescence intensity (MFI) for each sample was determined and the dose response data was analyzed using Graph Pad Prism. In order to fit MFI data in Graph Pad MFI data was normalized for each antibody, where 0% was defined as the lowest value and 100% was the highest value in the dose titration for each antibody.

Binding to human and cynomolgus monkey CD137 was confirmed in two separate experiments for exemplary antibody 1204/1205. The binding affinities were very similar between cynomolgus monkey and human CD137 (FIG. 14, Table 12.4)

TABLE 12.4 95% confidence intervals for the EC50 determined as an average from two experiments of normalized data. Binding to human Binding to cyno Clone name CD137, EC50 (μg/mL) CD137, EC50 (μg/mL) 1204/1205 0.23-0.39 0.11-0.16

Agonistic Activity of CD137 Antibodies in a Human T Cell Assay

Agonistic activity of CD137 mAb was evaluated in a T cell assay based on primary human CD8⁺ T cells. Briefly, CD8⁺ T cells were separated from human peripheral blood mononuclear cells by MACS separation (Miltenyi #130-096-495) according to the manufacturer's protocol. Cells were incubated in 96-well microtiter plates (NuncThermo Scientific #268200), pre-coated with anti-CD3 mAb (clone OKT3, Affymetrix eBioscience #16-0037) and titrated concentrations of the CD137 mAb to be tested. Following 72 or 96 hour incubation, culture medium was harvested and IFN-γ levels were determined by ELISA (BD #555142). Each clone was analyzed in multiple donors and compared to a reference CD137 mAb 111/112 and an isotype control (62/63).

Due to large intra-donor variations the stimulation index (SI, fold induction by mAb compared to isotype control) was determined for each sample and normalized to the stimulation index for the reference antibody 111/112.

The exemplary 1204/1205 antibody induced activation of T cells that was comparable or better compared to the reference antibody 111/112. Mean normalized SI±SD of 8 donors is presented in FIG. 15. Table 12.5 indicates the absolute IFN-γ levels induced by CD137 stimulation.

TABLE 12.5 IFN-γ production levels induced by the various mAb Ab Clone Mean IFN-γ Min IFN-γ Max IFN-γ No. of repeated name (pg/ml) (pg/ml) (pg/ml) experiments 62/63 2502 337 8526 13 111/112 42268 2256 136802 12 1204/1205 64430 13062 153136 8

Sequence Information

(SEQ ID NO: 207) VH CDR1 = GFTFSSYY (SEQ ID NO: 212) VH CDR2 = IGSYYGYT (SEQ ID NO: 217) VH CDR3 = ARAYYDYNYYYAYFDY (SEQ ID NO: 80) VL CDR1 = QSISSY (SEQ ID NO: 81) VL CDR2 = AAS (SEQ ID NO: 222) VL CDR3 = QQSVPHYPFT

TABLE 12.6 1205, light DIQMTQSPSSLSASVGDRVTITCRASQSISSYLNWY chain VL aa QQKPGKAPKLLIYAASSLQSGVPSRFSGSGSGTDFT sequence LTISSLQPEDFATYYCQQSVPHYPFTFGQGTKLEIK (SEQ ID NO: 177) 1205, light GACATCCAGATGACCCAGTCTCCATCCTCCCTGAGC chain VL nt GCATCTGTAGGAGACCGCGTCACCATCACTTGCCGG sequence GCAAGTCAGAGCATTAGCAGCTATTTAAATTGGTAT CAGCAGAAACCAGGGAAAGCCCCTAAGCTCCTGATC TATGCTGCATCCAGTTTGCAAAGTGGGGTCCCATCA CGTTTCAGTGGCAGTGGAAGCGGGACAGATTTCACT CTCACCATCAGCAGTCTGCAACCTGAAGATTTTGCA ACTTATTACTGTCAACAGTCTGTTCCGCACTACCCG TTCACTTTTGGCCAGGGGACCAAGCTGGAGATCAAA (SEQ ID NO: 178) 1204, heavy EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYYMGW chain VH aa VRQAPGKGLEWVSGIGSYYGYTGYADSVKGRFTISR sequence DNSKNTLYLQMNSLRAEDTAVYYCARAYYDYNYYYA YFDYWGQGTLVTVSS (SEQ ID NO: 179) 1204, heavy GAGGTGCAGCTGTTGGAGAGCGGGGGAGGCTTGGTA chain VH nt CAGCCTGGGGGGTCCCTGCGCCTCTCCTGTGCAGCC sequence AGCGGATTCACCTTTTCTTCTTACTACATGGGTTGG GTCCGCCAGGCTCCAGGGAAGGGGCTGGAGTGGGTC TCAGGTATTGGTTCTTACTACGGTTACACAGGTTAT GCAGACTCCGTGAAGGGCCGGTTCACCATCTCCCGT GACAATTCCAAGAACACGCTGTATCTGCAAATGAAC AGCCTGCGTGCCGAGGACACGGCTGTATATTATTGT GCGCGCGCTTACTACGACTACAACTACTACTACGCT TACTTTGACTATTGGGGCCAGGGAACCCTGGTCACC GTCTCCTCA (SEQ ID NO: 180)

Example 13—Domain Mapping of CD137 Antibodies

The extracellular part of CD137 consists of four domains, which can be further subdivided into two modules. Genes of CD137 human/mouse chimeras were synthesized using standard laboratory techniques. The different chimeras were designed by exchanging domains or modules of the human CD137 with corresponding mouse CD137. The chimeras were designed based on evaluation of the human and mouse sequences and 3D investigation of human CD137. The synthesized genes were assigned project specific ID numbers (see Table 13.1). The constructs were cloned into pcDNA3.1 vector (Invitrogen) and transiently transfected into FreeStyle 293-F cells (Invitrogen). The transfected cells were incubated with CD137 antibodies and control antibodies, followed by incubation with anti-human IgG-PE (Jackson Immunoresearch) for detection and analyzed with FACS Verse (BD Biosciences). Binding to the different chimeric constructs was calculated as relative MFI compared to the binding of the isotype control, followed by normalization to the full-length human CD137 construct to minimize the effect of affinity differences between individual antibodies.

The results for binding of exemplary antibody 1204/1205 to the different constructs are shown in Table 13.2. As indicated by these results, antibody 1204/1205 is mainly dependent on domain 2. In addition, some loss of binding is also seen for construct 1555, indicating an impact of domain 1 as well.

TABLE 13.1 CD137 constructs used for the domain mapping Sequence Description 1550 (1407) Human CD137 with mouse domains 1, 2A and 2B (aa 24-86) 1551 (1408) Human CD137 with mouse domains 2A, 2B and 3A (aa 47-96) 1552 (1409) Human CD137 with mouse domains 2B, 3A and 3B (aa 64-118) 1553 (1410) Human CD137 with mouse domains 3A, 3B and 4A (aa 87-133) 1554 (1411) Human CD137 with mouse domains 3B, 4A and 4B (aa 97-159) 1555 (1412) Human CD137 with mouse domains 1 and 4B and region of unknown function (aa 24-46 and aa 139-186) 1030 Full length human CD137

(wherein the number in parentheses identifies the same CD137 construct, but corresponds to an alternative clone numbering system used in the figures)

TABLE 13.2 Binding of antibody 1204/1205 to the different CD137 constructs measured by flow cytometry. Median fluorescence intensity (MFI) for mAb sample/isotype control, normalized to full-length human CD137. Sequence Relative binding 1550 0.07 1551 0.11 1552 0.13 1553 0.85 1554 0.73 1555 0.28 1030 1

Bispecific Antibodies

Example 14—Agonistic Activity of Exemplary Bispecific Molecules In Vitro

Human CD3 positive T cells were purified from Ficoll separated PBMCs (obtained from leucocyte filters from the blood bank of the Lund University Hospital) using negative selection (Pan T cell Isolation Kit, human, Miltenyi, 130-096-535). 50 μl of anti-CD3 (clone: UCHT-1, BD, concentration: 1 μg/ml) diluted in PBS was coated to the surface of non-tissue culture treated, U-shaped 96-well plates (Nunc, VWR #738-0147) over night at 4° C. Bispecific anti-OX40/anti-CD137 polypeptides were added in a serial dilution to the wells and compared at the same molar concentrations as controls. Two different controls were used for each bispecific molecule tested. The first control is an isotype control antibody specific for GFP (designated 1188-1187). The second control is a mixture of the monospecific OX40 and CD137 antibodies corresponding to the tested bispecific. After 72 h of incubation in a moisture chamber at 37° C., 5% CO2, IL-2 levels were measured in the supernatant.

As shown in FIG. 16A-H, there is a dose-dependent effect of the bispecific molecules, which induce an increase in human T cell activation (measured by an increase in IL-2 production) when cultured in plates coated with anti-CD3. The controls do not. FIG. 17 shows the results of a similar assay when conducted at a fixed concentration for the exemplary bispecific antibody 1164/1135-1204/1205 and controls (1 nM). In this assay Human PBMC were obtained from leucocyte concentrates from the blood bank of the Lund University Hospital) using Ficoll density separation. 50 μl of anti-CD3 (clone: UCHT-1, BD, concentration: 1 μg/ml) diluted in PBS was coated to the surface of a non-tissue cultured treated, U-shaped 96-well plates (Nunc, VWR #738-0147) over night at 4° C. The bispecific anti-OX40/anti-CD137 antibody 1164/1135-1204/1205 was added soluble to the wells together with PBMCs and compared at the same molar concentration (1 nM) with an isotype control 1188-1187 or its corresponding monospecific OX40 and CD137 antibodies. After 48 h of incubation in a moisture chamber at 37° C., 5% C02, IL-2 levels were measured in the supernatants. The bispecific antibody induces significantly higher T cell activation than controls even in a mixed population of different cells (PBMCs).

Since this assay represents an experimental model of a tumor microenvironment where both OX40 and CD137 are relatively overexpressed, the results suggest that the tested bispecific molecules can be expected to have a greater effect than monospecific antibodies in such a microenvironment.

Example 15—Dual Binding to Both Targets of Exemplary Bispecific Molecules

Measurement by ELISA

ELISA plates were coated with OX40-Fc (R&D systems, #3388_OX) (0.4 μg/ml, 50 μl/well) over night at 4° C. The ELISA plates were washed with PBST and then blocked with PBST+2% BSA for 1 h at room temperature. After 3 washes with PBST, bispecific antibodies and controls were added at different concentrations, from 50 nM to 6.4×10⁻⁴ nM and incubated for 1 h at room temperature. The ELISA plates were washed and biotinylated CD137-Fc at (1 μg/ml) was added and incubated on the plates for 1 h at room temperature. The plates were washed three times with PBST and HRP-labelled streptavidin was used for detection of binding (1 h incubation at room temperature). The plates were washed 6 times with PBST and then SuperSignal Pico Luminescent was used as substrate and luminescence was measured using Fluostar Optima according to the manufacturers' protocols.

Binding to both targets was confirmed for all tested bispecific molecules as is shown in FIG. 18. Each of the bispecific antibodies was detectable at 8×10⁻² nM. The bispecific antibodies also bind to both targets when the assay is reversed (coating CD137 and using soluble biotinylated OX40 for detection (data not shown).

Example 16—Selection of CD137 Antibodies from Alligator GOLD™ Library and Overview of Tested Clones

Phage display selections were performed using a human antibody (scFv) library, Alligator GOLD. Selections towards recombinant CD137 in soluble form, coated onto the surface of beads or tubes, or expressed on the surface of CD137-transfected cells were performed. CTLA4-Fc and an irrelevant His-tagged protein were used as non-targets included in excess in the selections. Prior to each selection round, the phage stocks were pre-selected towards biotinylated beriglobin, CTLA4-Fc, beads or CD137 negative cells to remove unspecific binders.

To identify specific binders from the phage selection, approximately 4500 individual clones were screened in phage format using ELISA coated with either recombinant target (CD137-Fc) or non-target (CTLA4-Fc) protein, followed by confirmation as soluble scFv for some clones. Clones exhibiting specific binding to CD137 were sequenced and unique clones were produced as IgG for further characterization.

Five human CD137 antibodies with agonistic properties have been characterized and described herein (summarized in Table 16.1). The tested antibodies are comparable to clinically active reference antibodies in a functional T cell assay. Four different classes of antibodies were identified based on epitope domain mapping studies. Both CD137 blocking and non-blocking antibodies were obtained.

TABLE 16.1 Summary of the CD137 antibodies Cynomolgus EC50 cell CD137 binding (CHO T cell cross- Target transfectants) ka kd KD CD137L Domain Antibody agonist reactivity Specificity (μg/mL) (1/Ms) (1/s) (M) block binding 1204/1205 Yes Yes OK 0.23-0.39 3E+05 3E−04 1E−09 Yes 2 1214/1215 Yes Yes OK 0.89-1.28 5E+04 3E−05 7E−10 No ND 1618/1619 Yes Yes OK 0.11-0.19 1E+06 1E−04 1E−10 No 1 1620/1621 Yes Yes OK 0.20-0.42 4E+05 5E−04 1E−09 Yes 3B-4A 1626/1627 Yes Yes OK 0.38-0.67 2E+05 3E−04 1E−09 No ND

Example 17—Characteristics of CD137 Antibodies—Binding to Human CD137 Measured by ELISA

Binding of CD137 antibodies to recombinant human CD137 was determined by sandwich ELISA. Briefly, ELISA plates (Greiner #655074) coated with recombinant human CD137-Fc (R&D #838-4B) were incubated with serial dilutions of the various CD137 antibodies to be investigated. CD137 antibodies were detected using HRP-conjugated goat-anti-human kappa light chain (AbD Serotec # STAR127P) and developed with SuperSignal ELISA Pico Chemiluminescent substrate (Pierce #37069). EC50 values of the various antibodies were determined in multiple separate experiments.

Two different reference antibodies have been used in this study, designated 1811/1812 and 1813/1814.

Reference antibody 1811/1812 is a CD137 agonist that binds to domain 1 of CD137 and does not block the ligand. It binds to its target with high affinity and specificity. An antibody with this sequence has been evaluated in clinical trials.

Reference antibody 1813/1814 is and antibody that binds to domain 3-4 on CD137. It binds to its target with high affinity and specificity. An antibody with this sequence has been evaluated in clinical trials.

The majority of the antibodies exhibit EC50 values in a similar range as those of the reference antibodies, i.e. sub nM or low nM. Data is summarized in Table 17.1.

TABLE 17.1 EC50 values (nM) of Alligator-GOLD-derived CD137 antibodies determined by ELISA for human CD137. Clone name Mean SD n 1811/1812 0.75 0.137 8 1813/1814 0.33 0.069 5 1204/1205 0.34 0.058 6 1214/1215 0.98 0.124 6 1618/1619 0.35 0.018 4 1620/1621 0.38 0.137 2 1626/1627 0.22 0.057 2 n = number of data points.

Example 18—Characteristics of CD137 Antibodies—Binding to Human and Cynomolgus CD137 Measured by Flow Cytometry

Binding and EC50 to human and cynomolgus (Macaca fascicularis) CD137 was determined using flow cytometry of CHO cells transfected with human CD137, cynomolgus CD137 or empty vector. The extracellular part of human or cynomolgus CD137 was fused to the transmembrane and intracellular part of human CD40 and cloned into pcDNA3.0. The vector was subsequently stably transfected into CHO cells. Expression of CD137 was confirmed by flow cytometry using CD137 antibody (human CD137-PE, BD Biosciences #555956) for 30 min at 4° C. CD137-transfected and empty vector-transfected cells were incubated with CD137 antibodies for at least 1 h at 4° C. to saturate the binding. In order to minimize antibody internalization, 0.05% sodium azide was used in the incubation buffer and all work was performed on ice. The CD137 antibodies were detected using PE-conjugated anti-hIgG antibody (109-115-098, Jackson Immunoresearch laboratories), incubated for 30 min at 4° C. Directly after staining the cells were fixed with a paraformaldehyde solution (10× concentrate BD CellFIX, BD biosciences #340181). Cells were analyzed by flow cytometry using FACSVerse (BD Biosciences). The median fluorescence intensity (MFI) for each sample was determined and the dose response data was analysed using Graph Pad Prism.

MFI data was normalized for each antibody, where 0% is defined as the lowest value and 100% is the highest value in the dose titration for each antibody. EC50 and 95% confidence interval were calculated with Graph-Pad Prism based on data from the two experiments (non-linear regression (curve fit), constraints set to 0 and 100).

Binding to CHO-huCD137, CHO-cyCD137 and CHO-pcDNA was confirmed in two separate experiments (FIG. 20). All CD137 antibodies bind relatively well to human CD137 with EC50 comparable with the two reference antibodies 1181/1812 and 1813/1814. All CD137 antibodies tested bind well to cynomolgus CD137, except for reference antibody 1811/1812 which does not bind at all and clone 1620/1621 which binds weakly and does not reach a complete saturation. The binding pattern has also been confirmed on stimulated primary cynomolgus PBL.

The EC50 determination is presented as 95% confidence intervals for each CD137 antibody tested in order to include the inter and intra assay variations (Table 18.1)

TABLE 18.1 95% confidence intervals for the EC50 of each CD137 antibody determined as an average from two experiments of normalized data. Binding to human Binding to cyno Ratio, Clone name CD137, EC50 (μg/mL) CD137, EC50 (μg/mL) cyno:human 1204/1205 0.23-0.39 0.11-0.16 0.43 1214/1215 0.89-1.28 0.41-0.80 0.54 1618/1619 0.11-0.19 0.086-0.15  0.77 1620/1621 0.20-0.42  3-5* 14*   1626/1627 0.38-0.67 0.16-0.27 0.41

Example 19—Characteristics of CD137 Antibodies—Affinity Measured by Biacore

Human CD137 (R&D systems) was immobilized to the Biacore™ sensorchip, CMS, using conventional amine coupling. The tested antibody and control (serially diluted 1/2 10-0.63 nM) were analyzed for binding in HBS-P (GE, # BR-1003-68) at a flow rate of 30 μl/ml. The association was followed for 5 minutes and the dissociation for 15 minutes. Regeneration was performed twice using 10 mM Glycine pH 1.7 for 30 seconds. The kinetic parameters and the affinity constants were calculated using 1:1 Langmuir model.

Results and Conclusions

The affinities of the antibodies were in the nanomolar to sub-nanomolar range (Table 19.1) measured using bivalent antibodies flowed over CD137 coated on the chip surface.

TABLE 19.1 Kinetic parameters measured by surface plasmon resonance Sample ka (1/Ms) kd (1/s) KD (M) 1204 2.54E+05 2.80E−04 1.10E−09 1214 4.54E+04 3.17E−05 6.99E−10 1618 1.02E+06 1.10E−04 1.07E−10 1620 3.92E+05 5.19E−04 1.32E−09 1626 2.32E+05 2.94E−04 1.27E−09

Example 20—Characteristics of CD137 Antibodies—Target Specificity of the CD137 Antibodies

Determination of unspecific binding of CD137 antibodies to other TNFR superfamily members (CD40 and OX40) was evaluated to detect potential propensity to cross react to non-target proteins.

ELISA plates (Greiner #655074) were coated with 50 μl/well of recombinant human OX40 (R&D #1493-CD), CD40-Fc (Ancell #504-820) or CD137 (R&D #838-4B) diluted to a final concentration of 0.5 μg/ml in PBS for 1 h at 37° C. or overnight at 4° C. Plates were washed with PBS+0.05% TWEEN20 (PBST), followed by block with PBST+1% bovine serum albumin (BSA). Antibody samples were prepared as serial 1/10 dilutions from 10-0.01 μg/ml in PBST+1% BSA and incubated for 1 h in room temperature, followed by detection using a horse radish peroxidase-conjugated anti-human kappa light chain antibody (AbD Serotec # STAR127P) and developed using SuperSignal ELISA Pico Chemiluminescent substrate (Pierce ThermoScientific #37069).

Results and Conclusions

TABLE 20.1 Summary of CD137 antibody unspecific binding to OX40 and CD40 pAb Binding to OX40 and CD40 1204/1205 No 1214/1215 No 1618/1619 No 1620/1621 No 1626/1627 No

No binding to OX40 or CD40 of the CD137 antibodies was detected. An overview of antibodies analyzed, and results from the two experiments is shown in Table 20.1.

Further, binding to primary PBL from multiple blood donors was tested. The binding to PBL was similar to Reference antibodies. No relevant unspecific binding to non-target proteins was detected.

Example 21—Characteristics of CD137 Antibodies—Domain Mapping of Antibodies Binding to CD137

The ability of each antibody to bind to a panel of human/mouse CD137 chimeras expressed on the surface of transfected cells was analyzed by flow cytometry.

The chimeras were designed by exchanging domains or modules of the human CD137 with the corresponding mouse domain (FIG. 21). Genes of CD137 human/mouse chimeras were synthesized (GenScript) and constructs cloned into pcDNA3.1 vector (Invitrogen) and transiently transfected into FreeStyle 293-F cells (Invitrogen). The transfected cells were incubated with CD137 antibodies and control antibodies, followed by incubation with anti-human IgG-PE (Jackson Immunoresearch) for detection and analyzed with FACS Verse (BD Biosciences). Binding to the different chimeric constructs was calculated as relative MFI compared to the binding of the isotype control, followed by normalization to the full-length human CD137 construct to minimize the effect of affinity differences between individual antibodies.

Results and Conclusions

6 binding patterns can be observed as described below. Data is summarized in Table 21.1.

Pattern A

Antibody 1618/1619 is dependent on domain 1.

Pattern B

Antibody 1204/1205 is mainly dependent on domain 2. In addition, some loss of binding is also seen for construct 1555, indicating an impact of domain 1 as well.

Pattern C

Antibody 1620/1621 appears to be mainly dependent on domains 3B-4A. However, loss of binding is seen for all constructs, making this pattern quite similar to pattern D.

Pattern D

For antibodies 1214/1215 and 1626/1627, no clear dependence on particular CD137 domains could be demonstrated. Instead, these antibodies exhibited extensive loss of binding for all chimeras.

TABLE 21.1 Domain mapping of CD137 antibodies. The table displays relative binding to different CD137 constructs in which part of the human CD137 sequence has been exchanged to the murine CD137 sequence. Median fluorescence intensity (MFI) for antibody sample/isotype control, normalized to full-length human CD137. Group A B C D Domain 1 2 3B-4A Unclear Clone 1214/1215 1618/1619 1204/1205 1620/1621 1626/1627 Exp 1 Exp 2 1550 0.11 0.07 0.17 0.10 0.06 0.14 (1407) 1551 0.67 0.11 0.33 0.11 0.07 0.15 (1408) 1552 1.20 0.13 0.18 0.11 0.32 0.13 (1409) 1553 1.24 0.85 0.17 0.14 0.41 0.15 (1410) 1554 1.01 0.73 0.17 0.12 0.26 0.15 (1411) 1555 0.12 0.28 0.32 0.29 0.30 0.45 (1412)  1030* 1 1 1 1 1 1 *Full-length CD137 (wherein the number in parentheses identifies the same CD137 construct, but corresponds to an alternative clone numbering system used in the figures)

Example 22—Characteristics of CD137 Antibodies—CD137 Ligand Blocking

The aim was to determine if the CD137 antibodies block the CD137 ligand (CD137L) binding.

In the previous domain mapping experiment the CD137 antibodies were divided in different groups based on their binding to similar subdomains of the CD137 antigen. If the CD137 antibodies bind to epitopes close to the ligand binding region, binding to the antigen can lead to partly or total block of ligand biding. Binding close to the CD137 ligand binding epitope may also affect the ligand binding due to steric hindrance or conformational changes of the CD137 ligand binding epitope. All CD137 antibodies were titrated against a fixed concentration of CD137L for evaluation of ligand blocking properties.

CHO-cells transfected with human CD137 were used for the ligand competition. The extracellular part of human CD137 was fused to the transmembrane and intracellular part of hCD40 and cloned into pcDNA3.0. The vector was subsequently stably transfected into CHO cells. The expression of CD137 was confirmed by staining with commercial antibody targeting CD137.

The CHO-huCD137 were pre-incubated with CD137 monoclonal antibodies, titrating down from a predetermined saturating concentration (25, 2.5 and 0.25 μg/ml), for 1 h at +4 C before the addition of CD137 ligand at a concentration at EC50. After co-incubation for another 30 min at +4 C, the cells were washed and bound CD137 ligand was detected with anti-FLAG-APC (Cell signaling technology). Before analyzation the cells were fixed with paraformaldehyde (10× concentrate BD CellFIX, BD biosciences). Analyzation was performed with FACSverse and the MFI (Median Fluorescence Intensity) was calculated with FlowJo software.

Results and Conclusions

The CD137L blocking experiment was performed two times. It can be concluded that not all CD137 mAbs tested were blocking the CD137 ligand binding (Table 22.1, FIG. 22). CD137 mAbs belonging to group B and C (1204 and 1620), binding to domain 2B-4A, were blocking the CD137L. Antibody 1814 has been reported to block the CD137L, however, this could not be verified in our CD137L blocking assay. 1812 and 1618, belonging to group A which bound to domain 1, did not block CD137 ligand, but instead synergistically increased the CD137L binding. Antibodies 1626 and 1214, did not block the CD137L in the two experiments performed.

TABLE 22.1 Maximal CD137 ligand competition of the CD137 antibodies, mean out of two experiments Group (domain mapping) CD137 mAb CD137L, max inhib. A 1618/1619 −22%   B 1204/1205 50% C 1620/1621 56% D 1626/1627 18% D 1214/1215 11%

Example 23—Characteristics of CD137 Antibodies—Competition ELISA

By competing each CD137 antibody with each another, it is possible to determine antibodies binding to similar epitopes based on their blocking pattern. The competition ELISA is performed by co-incubating biotinylated CD137 antibodies with non-biotinylated CD137 antibodies when binding to coated CD137-Fc. Competition is defined as loss of signal from the biotinylated CD137 antibody. Low competition values could either be due to no competition between the antibodies or binding kinetics of the antibodies. Binding of one antibody could also lead to steric hindrance or conformational changes when binding the antigen which affects the binding of the other CD137 antibody.

CD137 antibodies were biotinylated (EZ-link NHS-LC-Biotin, ThermoFisher) and intact binding properties to CD137-Fc was verified with ELISA by comparing EC50 between biotinylated and non-biotinylated anti-CD137 mAbs. Non-biotinylated anti-CD137 (anti-CD137) was pre-incubated to CD137-Fc at concentrations 30 times higher than the determined EC50 for 0.5 h. Without washing, anti-CD137-bio was added and co-incubated for another 1 h. The binding of anti-CD137-bio was detected with Streptavidin-HRP (Pierce). Competition was calculated as the relative number by dividing the binding measured to other antibodies relative to its maximum competition (competing with itself). The relative values obtained were normalized against the maximum blocking capacity (Table 23.1).

TABLE 23.1 Summary of CD137 antibody competition ELISA from two experiments Values are presented as % competition with CD137-bio Group comp ELISA X Y Group (domain mapping) A B C D 1618/1619 1204/1205 1620/1621 1626/1627 1214/1215 1812-bio 100 5 4 0 4 1814-bio 21 74 61 57 99 1214-bio 6 92 80 77 99 1618-bio 88 3 10 16 9 1620-bio 7 93 82 79 100 1626-bio 24 100 97 100 99 1204-bio 28 88 66 66 97

Results and Conclusions

The competition ELISA was performed twice. In both experiments, several of the CD137 mAbs did not fully compete with itself. When normalizing the relative competition values for each antibody a competition pattern emerged (Table 23.1). The antibodies 1812 and 1618 that belongs to domain mapping group A, displayed a unique pattern in the competition ELISA (group X). The other CD137 antibodies analyzed had asimilar blocking pattern (group Y). Differences in binding kinetics may explain some of the minor variations in the binding patterns among the antibodies of group Y, although it cannot be excluded that the small variations within group Y reflects actual differences in the epitope binding.

Example 24—Characteristics of CD137 Antibodies—In Vitro Efficacy of CD137 Antibodies

The aim was to identify CD137 antibodies with agonistic activity.

Agonistic activity of CD137 antibodies was evaluated in a T cell assay based on primary human CD8⁺ T cells. Briefly, CD8⁺ T cells were separated from human peripheral blood mononuclear cells by MACS separation (Miltenyi #130-096-495) according to the manufacturer's protocol. Cells were incubated in 96-well microtiter plates (NuncThermo Scientific #268200), pre-coated with anti-CD3 antibody (clone OKT3, Affymetrix eBioscience #16-0037) and titrated concentrations of the CD137 antibody to be tested. Following 72 or 96 hour incubation, culture medium was harvested and IFN-γ levels were determined by ELISA (BD #555142).

Each clone was analyzed in at least 6 donors and compared to the reference CD137 antibody 1811/1812 and the negative control antibody.

Due to large intra-donor variations the stimulation index (SI, fold induction by antibody compared to negative control) was determined for each sample and normalized to the stimulation index for the reference antibody 1811/1812.

Results and Conclusions

Several clones with efficacy comparable to the reference 1811/1812 were identified (see FIG. 23).

Table 24.1 indicates the absolute IFN-γ levels induced by CD137 stimulation. However, all antibodies were not analyzed head-to-head in all donors, and the normalized SI is more relevant for comparison of the efficacy. The antibodies were evaluated in an IgG1 format, and the efficacy was measured using antibodies coated to the surface of the wells, which may influence the efficacy.

TABLE 24.1 IFN-γ production levels induced by the various antibodies. Mean IFN-γ Min IFN-γ Max IFN-γ Clone name (pg/ml) (pg/ml) (pg/ml) n Ctrl IgG 2502 337 8526 13 1204/1205 64430 13062 153136 8 1214/1215 51836 8208 122163 8 1618/1619 33604 7380 111196 8 1620/1621 52448 7727 123127 8 1626/1627 15097 4159 32163 6

Bispecific Antibodies

Example 25—Bispecific Antibodies Targeting CD137 and CTLA4—Binding to Both Targetsin Dual ELISA

Aim: To evaluate and confirm the ability of the bispecific antibodies to bind to both targets using ELISA.

Material and Methods

ELISA plates were coated with rhCD137-Fc (rh4-1BB, 0.5 μg/ml) over night at 4° C. Bispecific antibodies were added in dilutions and detected by addition of biotinylated CTLA-4 (1 μg/ml) followed by HRP-labelled streptavidin (0.167 μg/ml). SuperSignal Pico Luminescent was used as substrate and luminescence was measured using Fluostar Optima.

Results

The bispecific antibodies could be detected at approximately 0.1 nM, and displayed EC50 values of approximately 0.5-1 nM in this assay (see FIG. 24). The results show that the bispecific CD137-CTLA-4 antibodies can bind to both targets simultaneously

Example 26—Bispecific Antibodies Targeting CD137 and CTLA4—Activation Ability in the Context of Cells Expressing CTLA-4

Aim

To determine the ability to activate immune cells in the context of cells expressing CTLA-4. The aim is to achieve higher activation (efficacy and potency) when CTLA-4 is present.

Material and Methods

Human CD8 positive T cells were obtained using negative selection (Miltenyi, human CD8+ T cell Isolation Kit, 130-096-495) of PBMC from leucocyte filters obtained from the blood bank (Lund University Hospital). CTLA-4 (Orencia, 2.5 μg/ml) and anti-CD3 (OKT-3, 3 ug/ml) was coated to the surface of a 96 well U-shaped culture plate (Nunc, VWR, #738-0147, non-tissue culture treated) over night at 4° C. Bispecific antibodies and controls were added to the wells. The IFNγ levels in the supernatant was measured after 96 h of incubation in a moisture chamber at 37° C., 5% CO₂.

Results

The results (FIG. 25, FIG. 26) show that the bispecific antibodies activate T cells only when cultured on plates coated with CTLA-4. The in vitro assay represents an experimental model of the situation in the tumor microenvironment where CTLA-4 is relatively overexpressed. The results thus implicate that the bispecific antibodies have an increased effect in an environment with high levels of CTLA-4, e.g. in the tumor.

Example 27—Synergism in Induction of ADCC by Exemplary Bispecific Antibodies Targeting CTLA4 and OX40 (Compared to Effect of Monospecific Antibodies, Alone or in Combination)

Materials and Methods

Assessment of Antibody-Dependent Cell-Mediated Cytotoxicity (ADCC)

Jurkat cells engineered to stably express FcγRIIIa receptor (V158 variant) and an NFAT response element driving expression of firefly luciferase (Promega Corporation) were used as effector cells in the assessment of ADCC. Antibodies were titrated in duplicate wells in a 96-well opaque luminescence plate, and effector cells and target cells expressing both OX40 and CTLA4 were added in a ratio of 5:1. After 6 h incubation in a 37° C., 95% O₂ humidified incubator, luciferase assay substrate (Promega Corporation) was added to all wells including medium control wells (for blank subtraction), and luminescence was detected on a FLUOstar Optima microplate reader (BMG LabTech). Fold-induced ADCC was calculated as: (target lysis−blank)/(spontaneous lysis−blank). Top values were calculated based on log(agonist) vs. response (three parameters) curve fit using Prism 6.0 (Graphpad, La Jolla, Calif., USA).

Antibodies

-   -   “1166/1167”=monospecific OX40 antibody     -   “Control IgG with CTLA-4 binding part”=monospecific CTLA4         binding domain fused to an IgG protein     -   “1166/1261”=exemplary bispecific antibody targeting OX40 and         CTLA4 (containing the identical OX40 and CTLA-4 binding part as         the monospecific binders described above).     -   “Ctrl IgG”=negative isotype control

Results

Exemplary Bispecific Antibody 1166/1261 Exhibits Superior Induction of ADCC

As shown in FIG. 27, detectable levels of ADCC were induced by all tested components. The negative isotype control did not induce any ADCC (data not shown). Most notably, the bispecific 1166/1261 antibody induced ˜123-fold ADCC compared to control. The monospecific OX40 antibody (1166/1167) induced ˜29-fold and the monospecific CTLA-4 binding domain (62/376) induced ˜10-fold ADCC, whereas the mixture of the two monospecific components (1166/1167+62/376) induced ˜31-fold ADCC.

There is thus an unexpected and marked synergy obtained by the bispecific molecule binding to OX40 and CTLA-4.

Example 28—Bispecific Antibodies Targeting OX40 and CTLA4—Specific Binding to Cells Expressing Both OX40 and CTLA4

Background

The aim of this study was to determine the binding efficacy and EC50 of 1166/1261 and the corresponding monospecific binding entities to cells expressing both OX40 and CTLA4 using flow cytometry. The bispecific antibody is designed to bind both OX40 and CTLA4 simultaneously. For this purpose, we used transfected CHO cells with a stable expression of our targets. CHO P4 cells have a high expression level of both OX40 and CTLA4.

Methods and Results

Double-transfected CHO cells expressing both OX40 and CTLA4 were originally sorted by FACS (Beckton Dickinson) into a cell pool expressing high levels of both targets (denoted CHO P4). Target expression was kept stable by culturing the cells under selection pressure of geneticine and zeocine. Untransfected CHO wild-type cells were used as controls.

Cells were stained with decreasing concentrations of 1166/1261 (an exemplary bispecific antibody targeting OX40 and CTLA4), or the two monospecific binders 1166/1167 (OX40 specific monoclonal antibody) and Control IgG with CTLA-4 binding part (monospecific CTLA4 binding IgG fusion protein) (200 nM-0,0034 nM), followed by PE-conjugated anti-human IgG. Fluorescence was detected using a FACSverse instrument, and the acquisition was analysed using FlowJo software. The median fluorescent intensity (MFI) was determined for each staining.

Binding efficacy curves for CHO P4 are presented in FIG. 28 (one representative experiment out of three). 1166/1261 binds to cells with high expression of OX40 and CTLA4 better than 1166/1167 or the Control IgG with a CTLA-4 binding entity. This is probably an additive effect of 1166/1261 being able to bind two targets simultaneously.

Example 29—Bispecific Antibodies Targeting OX40 and CTLA4—Dual Binding of Cells Expressing OX40 and CTLA4 Measured by Flow Cytometry

Aim

Measure simultaneous binding by 1166/1261 to both OX40 and CTLA4 over-expressed on cells by measuring the number of aggregated cells using flow cytometry.

Materials and Methods

CHO-OX40 cells and HEK-CTLA4 cells were intracellularly stained with the fluorescent dyes PKH-67 (green fluorescent dye) respectively PKH-26 (red fluorescent dye) (Sigma-Aldrich). After verifying homogenously stained cell population, the cells were mixed and incubated with either 1166/1261 (an exemplary bispecific antibody targeting OX40 and CTLA4) or a combination of the two monoclonal antibodies 1166/1167 (a monospecific anti-OX40 antibody) and a control IgG comprising a CTLA4-binding domain. After staining the cells were immediately fixed and the number of aggregated, double-positive cells were quantified using FACS-verse (BD biosciences). Data analyses and non-linear regression was performed using Graph Pad Prism v6.

Results and Conclusions

Exemplary bispecific antibody 1166/1261 increases the number of aggregated cells with increasing concentration (FIG. 29) (one representative experiment out of two).

Example 30—Bispecific Antibodies Targeting OX40 and CTLA4—Pharmacokinetics in Mice

Material and Methods

Antibodies

-   -   1166/1261 (an exemplary bispecific antibody targeting OX40 and         CTLA4)     -   1166/1167 (a monospecific control antibody targeting OX40)

In Vivo Studies

Female C57BL/6 (7-8w) mice from Taconic's Denmark were used in the experiments. All experiments were done by approval of Malmö/Lund ethical committee.

The mice were injected intraperitoneally with 100 μg of each antibody and blood was drawn either via vena saphena or at termination via vena cava into heparinized tubes after 0 h, 1 h, 4 h, 8 h, 24 h, 72 h and after 1 week. 3 mice were used for each time-point. Blood was spun at 2500 rpm for 30 min and plasma was frozen to −80 C° for further analysis.

Assays for Determination of 1166/1261 and 1166/1167 Levels in Plasma

Two different assays were used. A single target ELISA (ELISA1) and a dual ELISA (ELISA2). Briefly the assays consisted of the following steps. White high-binding flat-bottom, LIA plates (Greiner Bio-One, Austria) were coated over night with 0.8 μg/mL humanOX40-Fc (RnD Systems, MN, USA). After washing with Washing buffer (phosphatase buffer saline supplemented with 0.05% Tween 20 (PBST), Medicago, Sweden) the wells were blocked using PBST with 2% bovine serum albumin (BSA) (Merck, Germany) for 1 hour at ambient room temperature (ART) with shaking and washed again before plasma samples diluted 1:200 and 1:5000 in assay buffer (PBST+0.5% BSA) together with calibration curve samples (1166/1261, conc. 6-0.0012 μg/mL) were added. After incubation at ART for 1 h with shaking and subsequent washing, secondary reagent was added, consisting of either human anti-kappa-antibody horse radish peroxidase conjugated (HRP) (AbD Serotec, UK) for the single target ELISA or biotinylated human CTLA-4-Fc (Orencia) at 1 μg/mL followed by streptavidin-HRP (Thermo Fisher Scientific, MN, USA) according to the manufacturer's instructions for the dual ELISA. Signal was obtained using HRP substrate SuperSignal Pico Luminescence (Thermo Fisher Scientific). Luminescence measurements were collected after 10 minutes incubation in darkness with shaking using a Flurostar Optima (MBG Labtech, Germany). The data was analyzed by using GraphPad Prism program.

Results

Samples collected at the different time points after injection with 1166/1261 and 1166/1167 were analyzed with only single target ELISA or single target and dual ELISA for determination of the plasma levels of 1166/1261 and 1166/1167 respectively. The results show that the levels of 1166/1261 and 1166/1167 in plasma increased around the first 4 hours after peritoneal injection and then reduced (FIG. 30 upper panel). Detectable levels of both 1166/1261 and 1166/1167 are present in plasma after one week (FIG. 30 middle and lower panels).

The levels of 1166/1261 in plasma are similar to the levels obtained for the monoclonal antibody 1166/1167 indicating that 1166/1261 exhibits a good half-life in vivo, comparable to that of an equivalent monospecific anti-OX40 antibody.

References

-   Hemerle T., Wulhfard S., Neri D., (2012) A critical evaluation of     the tumor-targeting properties of bispecific antibodies based on     quantitative biodistribution data. Protein Engineering and Design,     25, pp 851-854.

Example 31—Bispecific Antibodies Targeting OX40 and CTLA4—In Vivo Anti-Tumor Effect in HT-29 Colon Cancer Model

Summary

The anti-tumor effect of 1166/1261 (an exemplary bispecific antibody targeting OX40 and CTLA4) was investigated using hPBMC humanized immunodefiecient mice and subcutaneous tumor models of HT-29 colon carcinoma.

1166-1261 demonstrated statistically significant tumor volume inhibition.

Material and Methods

Female SCID-Beige mice (6-9w) from Taconic's Denmark were used in the experiments. All experiments were done by approval of Malmö/Lund ethical committee.

HT-29 colon cancer were obtained from ATCC and cultivated according to ATCC recommendations. The HT-29 cell line growing in log phase was injected subcutaneously (4×10⁶ cells in 100-200 μL at day 0 (DO)). Human PBMC (7×10⁶ in 200 μL) isolated from leukocyte concentrates was injected intraperitoneally at the same day. Intraperitoneal treatments (667 pmol) were done at days 6, 13, and 20.

Leukocyte concentrates were obtained from Lund University Hospital.

Tumor was measured with a caliper in width, length and height of which the tumor volume calculated (w/2×l/2×h/2×pi×(4/3)). The animals were terminated before the tumor volume reached 2 cm³, at wounding, or affected health of the mice.

The data were analyzed by by Mann-Whitney test using the GraphPad Prism program. Responder donors were considered those donors that were responsive to the reference antibody 1874. Minimum of 10% average tumor inhibition during the exponential tumor growth period was considered as a response.

Results

Pooled data from mice engrafted with responder donors (4 donors from two separate experiments) demonstrated statistically significant anti-tumor efficacy at days 12-16 in the form of inhibition of tumor growth when treated with the 1166/1261 antibody (p=0.0469 to p=0.0074, Mann-Whitney non parametric, 2-tail) in comparison to the vehicle group (ZZ). The percentage of tumor volume inhibition ranged from 22-36% with 1166/1261 between days 10 and 21 (see FIG. 31 and Table 31.1).

In conclusion, the anti-tumor effect of 1166/1261 was investigated using hPBMC humanized immunodeficient mice and subcutaneous tumor models of HT-29 colon carcinoma. 1166/1261 demonstrated statistically significant tumor volume inhibition.

TABLE 31.1 Statistical analysis and percent tumor inhibition Day after Tumor growth p-value tumor inhibition (tumor volume) (Mann- inoculation compared to vehicle (%) Whitney 2-tail) D10 22.8 0.1298 D12 35.4 0.0315 D14 35.9 0.0074 D16 31.5 0.0469 D19 30.8 0.1059 D21 22.1 0.1067

Example 32—Bispecific Antibodies Targeting OX40 and CTLA4—In Vivo Anti-Tumor Effect in Raji Lymphoma Model

Summary

The anti-tumor effect of 1166/1261 (an exemplary bispecific antibody targeting OX40 and CTLA4) was investigated using hPBMC humanized immunodeficient mice and subcutaneous tumor models of Raji B-cell lymphoma.

1166/1261 demonstrated statistically significant tumor volume inhibition.

Material and Methods

Female SCID-Beige mice (6-9w) from Taconic's Denmark were used in the experiments. All experiments were done by approval of Malmö/Lund ethical committee.

Raji B-cell lymphoma was obtained from ATCC and cultivated according to ATCC recommendations. The Raji cell line growing in log phase was injected subcutaneously (10×10⁶ cells) together with human PBMC (10×10⁶ in 200 μL), isolated from buffy coats. Intraperitoneal treatments (667 pmol) were done at days 0, 7, and 14.

Buffy coats were obtained from Kalmar University Hospital.

Tumor size was measured with a caliper in width, length and height of which the tumor volume calculated (w/2×l/2×h/2×pi×(4/3)). The animals were terminated before the tumor volume reached 2 cm³, at wounding, or affected health of the mice.

The data were analyzed by Mann-Whitney test using the GraphPad Prism program. Responder donors were considered those donors that were responsive to the reference antibody 1874. Minimum of 10% average tumor inhibition during the exponential tumor growth period was considered as a response.

Results and Conclusions

Pooled data from experimental groups with responding donors, the bispecific 1166/1261 antibody demonstrated statistically significant anti-tumor efficacy at days 14 and 21 (p=0.0068 and p=0,0288, Mann-Whitney, 2-tail) in comparison to the vehicle (Table 32.1).

TABLE 32.1 Statistical analysis and percent tumor inhibition Tumor Tumor Tumor growth volume in volume in inhibition (tumor p-value Day after vehicle- animals volume) (Mann- tumor treated treated with compared to vehicle Whitney inoculation animals 1166/1261 (%) 2-tail) D10 14.2 13.8 6.1 0.6842 D12 35.7 21.5 39.9 0.0603 D14 61.8 33.6 45.7 0.0068 D17 105.3 76.0 27.8 0.3527 D19 205.1 133.3 35 0.0524 D21 314.8 187.0 40.6 0.0288 D24 467.5 299.9 37.2 0.054 D26 529.7 360.1 32 0.063 

The invention claimed is:
 1. A bispecific polypeptide comprising a first binding domain, designated B1, which is capable of specifically binding to a first T cell target, and a second binding domain, designated B2, which is capable of specifically binding to a second T cell target, wherein the first and second T cell targets are different targets; wherein the first T cell target is OX40; wherein B1 is an antibody or antigen-binding fragment thereof specific for OX40; wherein B1 comprises a heavy chain variable region amino acid sequence comprising SEQ ID NO: 91, and the B1 comprises a light chain variable region amino acid sequence comprising SEQ ID NO: 89; wherein the second T cell target is CTLA-4; wherein B2 is a polypeptide binding domain specific for CTLA-4; wherein B2 comprises an amino acid sequence comprising SEQ ID NO: 17 wherein the polypeptide comprises at least one polypeptide chain arranged according to the formulae: a light chain of B1-(X)n-B2, written in the direction N-C; and wherein X is a linker and n is 0 or
 1. 2. The polypeptide according to claim 1 wherein the antigen-binding fragment is selected from the group consisting of: an Fv fragment, a single chain Fv fragment, a disulphide-bonded Fv fragment, a Fab-like fragment, a Fab fragment, a Fab′ fragment, a F(ab)₂ fragment, and domain antibodies.
 3. The polypeptide according to claim 1, wherein B1 comprises a human Fc region or a variant of a said region, where the region is an IgG1, IgG2, IgG3 or IgG4 region.
 4. The polypeptide according to claim 1, wherein the polypeptide is capable of inducing antibody dependent cell cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), complement-dependent cytotoxicity (CDC), apoptosis, and/or inducing tumour immunity.
 5. The polypeptide according to claim 1 in which the CTLA-4 specifically bound by the polypeptide is primate or murine CTLA-4, and/or wherein the OX40 specifically bound by the polypeptide is primate OX40.
 6. The polypeptide according to claim 1, wherein X is a peptide with the amino acid sequence SGGGGSGGGGS (SEQ ID NO: 47), SGGGGSGGGGSAP (SEQ ID NO: 48), NFSQP (SEQ ID NO:49), KRTVA (SEQ ID NO: 50), GGGGSGGGGSGGGGS (SEQ ID NO: 144) or (SG)m, where m=1 to
 7. 7. The polypeptide according to claim 1, which binds to human OX40 with a Kd of less than 50×10⁻¹⁰M, 25×10⁻¹⁰M, or 20×10⁻¹⁰M and/or which binds to human CTLA-4 with a Kd value which is less than 60×10⁻⁹M, 25×10⁻⁹M, or 10×10⁻⁹M.
 8. The polypeptide according to claim 1, which induces an increase in the activity of an effector T cell, optionally wherein said increase is at least 1.5 fold, 4.5 fold or 7 fold higher than the increase in activity of an effector T cell induced by a combination of B1 and B2 administered to the T cell as separate molecules.
 9. The polypeptide according to claim 8, wherein said increase in T cell activity is an increase in proliferation and/or IL-2 production by the T cell.
 10. The polypeptide according to claim 1, wherein B1 exhibits at least one of the following functional characteristics when present independently of B2: I. binding to human OX40 with a K_(D) value which is less than 10×10⁻¹⁰M; II. does not bind to murine OX40; and III. does not bind to other human TNFR superfamily members.
 11. A composition comprising a bispecific polypeptide according to claim 1 and at least one pharmaceutically acceptable diluent or carrier.
 12. The polypeptide according to claim 1 conjugated to an additional therapeutic moiety. 